Twump

A self-disparaging loser. Someone who dislikes themselves so much that you hate them. Someone who self loathes to the point of exhaustion. An annoying complainer about one's hardships.

Yeah, she was sexting other dudes, but being a little twump and talking about everything you think is wrong with you won't make her want you again. Have some confidence, pretend not care, work on yourself in private, and maybe you'll have a chance.