<human>: We've been dating for around 5 months, and everything was fine until one day she suddenly started to become really weird. Everything happened extremely quickly, & within one week she had broken up with me after I had given her some space (it's what she asked for, I still don't know why). She's been texting me and she's been saying that she still wants to be friends, and that her number one priority is to make sure that I get over her and I'm not miserable. But I am. I can't stop thinking about why she's "lost feelings" for me in the span of one week (everything was perfectly okay before).

I've been extremely upset at work, and school, and I've had a few nights of crying alone too. I can't somehow stop thinking that she's hiding something from me. She's obviously not reacting the same way I am, which also bothers me, because we had a great relationship. The other night, she went out to party and had lots of fun and I sat at home and nearly cried the entire night. I'm afraid of being alone, but I'm not an ugly guy. I know I can go out there and find someone else very quickly, but I'm just feeling very heartbroken at the moment. Anyways, I'm not sure what to do. How do I handle this situation? & Should I even bother worrying about why she did what she did? I'm in need of some emotional support right now, ANYTHING would be gladly appreciated. Thanks guys

Can you condense the text into a few key points?
<bot>: Girlfriend broke up with me because her feelings have changed for me. Somehow can't stop thinking that she might be hiding something from me. Feeling extremely heartbroken about the whole situation.