Rebound relationship after FWB?

happilyforeveralone
At the beginning of the year my friends with benefits told me we had to stop sleeping together. He gave this whole spiel about not being able to commit and not wanting to hurt me or get hurt himself. Basically every fuck boy reason you can think of to break up he said.

I promptly cut him off after this because he was still trying to hang out as friends and I refused to be kept as a backup. He was really upset when I told him I was no longer going to be in his life and he did continue trying to contact me even though I refused to reply.

Anyway within a week he'd shacked up with a new girl and by the end of the month they were official. Like he introduced her as his girlfriend. Obviously this just made me shun him more because I was pissed that he'd lied to my face. And then all the self doubt about why he could commit to her and not to me crept in.

This girl was an exchange student who he'd have to have only known for 2 months at the very maximum and who was only in the country for 6 months total. The relationship lasted 2 months before he ended it because apparently he wanted to sleep with other people.

He has now come back to me and has started telling me how much he misses me and how he'd never liked her in the first place but had just 'needed someone'.

Honestly it's exhausting and I'm sick of his shit. I don't know why he suddenly decided he wants me back in his life. I was complaining about this to a mutual friend of ours and she suggested that maybe the reason he'd ran in the first place was because he'd caught feelings and his girlfriend was simply a way to expell those out of his system. I'm doubtful of this because that still doesn't explain why he'd be so eager to enter a relationship with her after he'd told me that the sex would always come first to him, but I do find the concept interesting. I dunno, do you think it's a plausible explanation or is my friend just romanticising the whole scenario?
Rebound relationship after FWB?
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