new if it makes you feel any better last Feb (after about 4 months) I had same experience as you only there were reasons - he wanted to meet his birth mother, felt insecure about that - he's adopted...
Someone somewhere has written down the rules eg don't get too invested too soon.
I think for those of us who're 30 and over with/without kids etc sometimes you're not the same as eg in 20's where you didn't care so much if things ended, picked yourself up easily etc. I don't know if men sense this too. Its weird though if you want to settle down, like them etc then they seem to get the brakes on after the magic number seems to be 3 months!
Can't recall what else you said apart from crap sex, maybe he thought that too but didn't say?
Just take it easy today, indulge and know you'll meet someone nice in future. 