<human>: Can you condense the text into a few key points?

A year ago my boyfriend at the time left me for someone else.  The details of it don't really matter here.   He was my best friend and our personalities and humor were very in-sync.  He's extremely weird and I'm extremely weird, but somehow our weirdnesses meshed in a way I've never felt before.  We just got along incredibly well.  He's expressed regret about ending things during the few times we've talked (contact has been cut off for a while at this point), but has continued to pursue the other woman, but at this point re-conciliating the relationship would be impossible due to the nature of the way he broke things off.

Ever since he left, I've found myself getting more depressed.  I feel incredibly alone.  I've dated quite a few people in between, all of whom are fantastic people who I should be lucky to date.  Every time, I feel a lack of desire to continue the relationship and just end up breaking up with them.

It's now approaching a year since he left, which is the same duration as the relationship itself.  Things continue to get worse to the point where I feel like I'm just never going to connect with anyone in that way again, and will just end up living what seems to be an empty life.  I continue to do all the the activities I love--invest in my health, career, and friendships.  I just don't feel fulfilled anymore.  Has anyone ever gone through something like this?  Is there anything I can actively do to prevent myself from being so bitter and sad?
<bot>: Was left over a year ago by someone incredibly unique in personality; don't think I can find that again.  Advice on how to get myself out of this year-long slump?