So my birthday was back in October and a girl I knew from school out the blue messaged me to say happy birthday. This was a girl that used to date a friend of mine maybe 6 or 7 years ago. We didn't really speak or know each other back then and haven't seen each other or spoke since.
Anyway we got talking we ask the usual catch up questions, what have you been up to since school ect. She then start to ask question about my relationship status as she had seen picture of me with a girl on Facebook. I told her that she was now an ex I just don't take the time to delete these old photos.
We continued to talk and I suggest that when I was back in the area in 3 weeks we should meet up to which she agreed.
2 and a bit weeks passed by before I messaged her to see if she still wanted to meet up to which again she said yes. We agreed on a time and place for that weekend. When the day came she messaged to say that she had been called back into work and she was sorry but could we rearrange. My thoughts been ok she could be blowing me off or she could be genuine so I give her one last chance.
A few weeks past and I was going to be back in the area so I message her to ask her out again. She agreed but upon arranging a time I messaged her is 8 ok? but there was no reply. Ok I'm not going to waste any more time chasing this up I'll move on.
However during the Christmas holiday she messaged me asking to meet up. I wasn't expecting this to be genuine by now but I agreed this time letting her decide a time and place.
So I turn up to the bar that night expecting to be stood up but much to my surprise she turned up looking like a HB9. We got drink and chatted for a few hours I made her laugh DHV and played my game. At the end of the night she offered to give me a lift home as I had arrived in a taxi. Conversation remained fluid and natural for the journey. When we arrived at my house she asked if I wanted to go out some time after new years and then we went our separate ways.
After new year I message her to to arrange going out but had to cancel as I caught a cold a few days before the date we arranged. I never heard back from her after that. I messaged her a few weeks later to say that I have changed my number and this is my new one but still no reply.

Im not overly fussed to make this work if this has reached a dead end, but if there is any advice as to what to do now or any opinions on what people would have done different or what I can learn from this it would be greatly appreciated.

maybe you'r overanalyzing, get out & in the field

-You should have kissed her
-You should have escalated
-You should be arranging another date, if she'll give you one

If she was throwing out IOIs and trying to get you to make a move, and you didn't... then you may have missed the boat. Nothing wrong with giving it another go, though.

Yeah i'm 100% sure I should have kissed her.
If she didn't respond to my last message do you think it would be better to call or text to ask her if she wants to go out?

Why wait for her to respond when you can call her and get an immediate read on the situation?

I always advocate calling.

Will save you sitting there worrying about it anyway.