help!! i m in huge shock DO I HAVE ANY CHANCE

Hello, first of all.i want to all greet you here.
Second i want to apologies if i m not verry concise.
My boyfriend been in a 2 and a half year relationship and i first broke up 6 months ago, got back togheter but the things were’nt as good as they used to be.
Recently i discovered he speaks with somebody else – a girl in the same college.
I confronted her she said they have a relationship. Even if they hadn t have a relstionship, at least they were in the beginnig.they dated once i know for sure.
Because i put him to choose . He said that he doesn t choose anything but doesnt want me anymore because of the scandal i made.
And then went to her house.
He said he just want to f** the girl and he didn’ t get the chance. And that is paying me a policy because in the summer i cheated on him with my ex. (I didn’t cheat he just text me happy birthday and had a small chat)

My actual ex (all i have are ex’es) called down on me that i was not liking him, seeing only it s flows and she at least sees him beautiful.
Of course due to the fact that he has a low self esteem he always compared with my ex. He has a huge frustration.
In the end, after choosing her over me on ambition because they know each other for 14 days. I put an end to it.
Actually being in.a huge shock i pleaded i begged and asked him.to think it thru. That lead to him going to her house – even if it was the first time.

I wished him well, and all the best. He replied that for my ex i fought , why i don t fight for him. That he was just a rebound. (A 2 and a half year rebound!) And said he’s all alone and doesn’t have anybody.
And shoulted that i never loved him like the ex.
That was the last conversation.
I maintained composure and told him that is not the case, that i wish him well and we ll speak some other time.
He slammed the phone and said it was the last time.

This happend yesterday, today he texted me 4 empty messages.
I don t know. He s only calling not texting wanting to screw his chsnces with the other girl, i think.

It may be my fault because i never asked him to be faithfull. And he was beacause i didn t oblige him.i only imposed one thing. Not to put anyone above me.
The thing he did last night. He chosed someone over me.
I think my chances to get him back are inignifiant. Not that he s worth it but i still want him back. Everything was great besides this. It s not only the shock.

Do i have any chance. Sorry for the long message