This is the first time I've posted on a forum so please bare with me, but I am looking for some advice..

I started dating this girl a I work with a couple of months back, (I originally turned her down but shortly after began having feelings for her and eventually plucked up the courage to ask her out). It started really well, we took it slow, meeting up a couple of times a week and texting most days and didn't get physical for 2 months. Not long after we decided to make it official and for the first 6 weeks everything was great, we saw each 3 or 4 times a week and spoke everyday, I loved spending time with her and knew that she did too.

However over the past couple of weeks things have taken a bit of a turn, it started out as a minor issue, she was off with me at work one day and after making plans to go out that night, I could tell she wasn't really up for it and she eventually called and cancelled. Ever since then I feel like things have changed. We still meet up 2-3 times a week and text each other everyday, but I feel like there is less warmth from her and it feels like I am making most of the effort. We used to text continuously for hours and now its a a text or so an hour and I feel like she is always annoyed, like it s a chore to see me.

Its got to the point where I have now asked a couple of times if everything is OK, both times she said she was having a few bad weeks and is it was nothing to do with me and she was really happy with me.. but I'm struggling to believe this. It came to a head a couple of days ago when I asked her out right if she wanted to break up, she said no and apologised for how shes been with me, but after expressing how I felt about the situation I'm still not getting much warmth back.

I might (probably) be overreacting over this but there are several reasons for this, I haven't been in a relationship for five years and after that amount of time of being alone I guess its hard to understand the ups and downs of relationships, this is also my first relationship where I have been more into the person than they are, It scares me how much i like her and that suspicion that something is wrong is really worrying me, also as you can probably tell I'm a massive over thinker, I over analyse every situation no matter how small and manage to put a negative spin on things.

All of the things I've been over thinking are so petty and minor that Its embarrassing when I talk about it to someone as I think I'm overreacting but cannot stop thinking about it. I want to make sure things are OK, but I als don't want to smother her and push her away.

So I guess the advice I'm seeking is I am overreacting, is it just that she's had a few bad weeks and just isn't in the mood to be warm and chatty all the time or is this the beginning of the end where things will ultimately just peter out?

Any advice positive or negative will be appreciated.

Thanks.