Confused about my Ex?!?!?!

So I have recently been speaking to my ex, who I didn't speak to for 2 years. I ended the relationship due to various reasons. I felt like it was very one sided, there wasn't much of a physical side and it always felt like we didn't do anything because she was never up for going out. I tried to talk about it but it was always brushed to the side. So as a result of that I ended the relationship and moved down south to start a new career. I'm not saying I am not without fault either, but those were the main reasons for me ending it.
I began speaking to her again around 2 months ago. It's been really nice talking to her again we always had a good connection as friends in anyway, we game together and pretty much talk everyday. So last week I asked if she wanted to come over to hang out, and it was really nice spending time with her, but I can feel myself getting closer to her again and getting feelings for her.
Now I usually feel that if that person is an ex then you shouldn't go back to them because it didn't work the first so likelyhood is that it won't work the second. However, she has changed so much since the time I haven't spoken to her. She was much more outgoing and she was the one dragging me out the house to go out and about. It was really nice seeing this side of her as its what I felt was missing from our relationship.

The thing that I'm worried about is my feelings getting in the way of things. Whether we stay as friends or try again, I don't want to ruin anything with this person, but I'm finding it harder and harder to hold my feelings in. I suppose I could just do with some advice on the situation. Whether I just leave it be and try and "control myself" or whether I should be open and honest.