<human>: Can you condense the text into three sentences or less?

So I've recently moved in with my GF of 7 months and everything is going great. She is everything I always wanted and I feel like I'm living the dream. The only issue is I can't stop thinking about me ex. 

For a bit of history, my ex was crazy (BPD or bi-polar not really sure) among a host of other problems. Unfortunately she was my first, and I was co-dependent and didn't know how to get out. We were together on and off for pretty much from the time I was 19 until maybe 30. Even after we were completely done we stayed in contact, and hooked up every now and then. I didn't completely cut contact until I met my current GF last year.
 
I don't know why I keep thinking about her. I guess it's because she was a huge part of my life for 15 years and this is probably the longest I have gone without talking to her. I certainly don't want her back, my current GF is better than her in every way. I am so excited about the future with her. I want us to get married and have kids, she does too. I never wanted that with my ex. 

I'm not sure what advice I'm actually looking for. I don't know if I need closure or what it is. Maybe I just wanted to get this off of my chest since I can't exactly talk to my GF about it. 

Thanks for reading anyway.
<bot>: My new GF is better than my ex in every way and I know I don't want her back, EVER. Why do I keep thinking about her?