I have a feeling that this is going to be a long story but I will try and shorten it as best as I can, also my grammer sucks so yeah, sorry :p anyways...
before I had heard about the game I was in a bar with a few friends and this hb9 walks in with her friends. I'm quite a shy person at the best of times so I didn't know how to start a conversation with them. it turns out that her friend started talking to me so that took that out of the way. long story short, I got a kiss and a number.

I was going away to start my training in the army at the time (in a few days ) so I didn't really talk to her until I was coming home (12 weeks later) I asked her out and said she should bring her friends aswell, everything went well and for the next few months everytime I was home which was about a week or 2 each time she would stay in my house pretty much every night. I thought this wouldn't last because she always said how it wrecked her head me having to go away for so long and I understood because I felt the same.

I would text her basically every day and would phone her sometimes but I started to pick up the vibe that she was losing interest as her texts started getting shorter and it took her longer to reply etc. turns out she had someone else on the go which I was pissed at but at the same time didn't say anything as we were not gf/bf it was more like fuck buds.

I ended up leaving the army as my father committed suicide about 6 months beforehand and my family wasn't really coping to well (me included) I also seen this as an oportunity to get closer to this girl.

we went out to a club one night and ended up back at my house. at this stage we wernt seeing each other anymore we were just friends that had to much to drink and we're horny :p I told her that I'm not going back to the army and that I had left. I still really liked this girl and we really did connect but she ended up shrugging it off and a few days later she was in a relationship with the other guy she was seeing.

I got a bad case of onitis (forget how to spell it) as I never really felt this strongly towards someone before and the fact that I had no other girls on the go at the time just made me feel like shit, I can remember thinking 'why him and not me?' and started to really over think the whole situation. I tried for a while to get her back but gave up in the end as I knew I was getting nowhere and it would blow my changes later on. (if I had any)

I used to work in a club that she went to every weekend so I used to see her and her friends and would serve them drinks etc. she always seemed a bit awkward around me (probably guilt) but I tried to not be awkward back.

there was one night me and a guy I work with got off work early and stayed to enjoy the rest of the night. I was in a really bad mood that night and was finding it hard to find my groove. I went out for a smoke and she came up to me and said that she broke up with her bf. I laughed because she was going away on holiday a few days later and clearly didn't want to be tied down with a bf beforehand. she said it was just coincidence but I beg to differ. anyway, she told me this then started kissing my neck (that she knew I liked ) I pulled away as she was drunk and I was sober (I really didn't want to be played by her and was seriously pissed off and wanted to go home at the time) she give me a funny look (which was expected) and we finished our smokes and parted ways. I had got over her by this stage and we havnt really talked much since.

the main reason for this post is this part

she goes to my gym and I really want to game her again just to prove to myself that I can, well there's that, there's also the fact that it was the best sex I've ever had!
we have bumped into each other a few times and it has been quite awkward as we sort of just said hi and walked on sort of thing (I think it's her but she thinks it's me)

I just don't know how to go about talking to her again as I think she has built this up to be so awkward when it's not and she can't relax around me.

should I ask her out and say something along the lines that I would like to get to know her again or should I start from scratch and open her? I really am stumped about it and any advice you could give me would really put my mind at ease.

I tried to make this as short as possible so I may have left out some details. so ask away if something is confusing.

thanks for reading and thanks in advance for any replies.

You are WAY over thinking, and WAY over complicating.

She fucked you before, she will again. Don't get all wrapped up in the future outcome. Netflix and chill.

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They call me the cat whisperer, cause I know exactly what the pussy needs.

I know I have been over thinking this alot as I have always been the kind of guy to over think things (it's a curse) I really do try not to but sometimes I can't help it.
I think im getting caught up in this because I haven't got a clue how to go about it. should I talk to her the next time im in the gym or Facebook her or I would see her the odd time in work. should I talk to her then?
I know these are really rookie questions but I just have a feeling im going to fuck things up if I don't get some advice beforehand.

Typically when you break up with someone, you’re trying to move on in life as you should.
But trying to have a have sex with an ex is very easy.

The caveat that should be remembered when you are doing or thinking about something like banging your ex is to do it if you’re certain there’s no interest in anything beyond sex.

WARNING; Sex with your ex rarely ends up all fucking sunshine and rainbows!

It could blow up in your fave like a grande in the latrine.

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They call me the cat whisperer, cause I know exactly what the pussy needs.

it's more of a personal mission if I'm being honest. yes it will be just sex and more than likely a 1 night stand but I need to prove to myself that I can do this. I just need a bit of advice on how to get there. like is there certain things I shouldn't do to an ex that I could do to a stranger like certian routines or something, is there certain things to avoid talking about etc.

I really do appreciate the help, I'm not just shrugging it off. this is just something I need to do.