<human>: So this has just happened out of the blue for me. It has been just about 1 year since we broke up and all of a sudden I can't stop thinking about her. This hasn't been a one day thing but actually has been going on for about a week and a half now. It's actually really starting to bother me and affect my end of the semester studying for classes.

For clarification my ex was the best girl friend I have had to date and i really hate how we broke up (partly me sort of taking things for granted plus a couple other minor things), but we ended up talking about the reasons and I ended up shutting that door. I really haven't talked to her for about 7 months (again broke up about 11 months ago but still talked for about 3 months till i moved out of town).

I really dont know what to do and i really can't get her out of my head. I ended up deleting all her pictures from my phone as well as her phone number so i really dont have much that triggers her in my mind. Is this normal where you just get nostalgia or so sort of lonely phase? Any advice would be nice.

Can you summarize the given text in a few sentences?
<bot>: Can't get my last GF out of my head (ongoing for over a week) after almost a year of being apart. Starting to really affect my state of mind.