<human>: My boyfriend just ended things with me out of the blue on Sunday.  It was completely unexpected.  In fact, we were on a date, having a really great time, being affectionate, and had even picked up things for our dinner together that night when out of the blue he said he was done.  Suffice to say I was a bit shocked.  He didn't give me a clear reason for what happened, and as far as I can tell he just wasn't feeling it anymore.  

The hardest thing to swallow about this whole situation is that I still feel like I was the best girlfriend I could have been throughout the relationship.  I was loving, cheerful, I gave him a lot of space and independence, I didn't call/text/need to be with him all the time, I wasn't trying to marry him or move in with him (and made that very clear), I did little nice things for him, etc.  We had so much fun together.  I don't want this to sound boastful, but I also know that I have a lot going for me.  I'm well-liked in our friend group, adventurous, fun, good-looking, driven, successful, cheerful, a PhD student at an Ivy League university....

Can someone help me make sense of this?  What makes a person lose interest when it's not one of the typical things (too clingy, not on the same page about commitment, etc.)?  The scariest thing is that my best self wasn't enough for the person I loved.

Does anyone, maybe someone going through a similar thing, want to PM?  I just need someone to talk to...

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Boyfriend broke up with me out of the blue for no apparent reason other than he may have lost interest.  I know I was a really great person and girlfriend throughout.  How can I make sense of this?