I may have fucked up. Not gonna lie. We are distant at the moment but we have a plan for the future. We've been together (same area) for 2 and a half years. She is a very old fashioned girl (I'm her first everything). I told her I was worried about being distant for too long and I was unsure what is going to happen between us (even though we have a plan) and she said "you can't leave me in limbo like that, tell me if it's a yes or no". We are also engaged. I have said many times I hate long distance so it makes sense she had the attitude "oh not this again". I then dumped her. My message to her kinda came out of nowhere. She's told me to never contact her again. I said ok. This all happened today.

I'm slightly unsure whether to say sorry. I may leave it, let her speak then fix things. Or for me to just come clean and say sorry. I just want to know how. How would a pick up artist say sorry? I mean everyone is human I guess, but dumping my fiance then saying sorry seems so stupid, like I can't control my feelings (I guess I didn't on that occasion). I also feel if I do, it's like she's got better of me. She told me to never contact again so it bothers me to. Maybe it sounds like an immature way to think... so what should I include in my apology and when should I apologise? Leave it for a bit or just do it as soon as I can?

Thanks for the help people.

Obviously you have an issue that you need to sort out before you get back with her.
Your issue is not the apology. You have something that annoys you. Find first how things could work out ( not how you are going to compromise because you love her) and then you will be ready to think if getting back the girl is worth the effort.

My opinion is that saying sorry when you are wrong is not a bad thing. It might give you a temporary loss of power but power is something you can get back with your attitude.

First of all there is no power in a decent relationship.

Why did you break up with her ? Why do you want to say sorry ?

You obviously can't control your feelings if you dumped her without being sure of it(Why else think about getting back together?).

As asked before: Why do you want to say sorry? "Sorry, I didn't mean it and want to give this a try" or "Sorry, it just wouldn't work out for me. I hope you understand and we can keep in touch."

Make up your mind and make it up fast because from my experience you need to get on top of that as soon as possible if it's a break up scenario(As in you've ended it). If you give her time her emotions will settle and she'll have all her girlfriends calling you every name under the sun "just because." They won't care if you were a nice guy or try consider how you feel, they'll just blacklist your ass and come up with that female empowering bullshit, probably handing her a "You're an independent woman that needs no man" type book(s).

If you want to get back with her you need to open up and tell her you weren't thinking straight. Don't be desperate and needy, just tell her how it is "I'm confused about this distance thing. If you're going to hold that against me then there's not much I can do except apologise and move on. I'm sorry, can we talk?" It's quite neutral and open to conversation. If she doesn't reply just move on. Simple as.