Bf doesnt believe or even try to listen to me !!!

So i have a bf we’ve been dating for seven months now and before we dated that was a guy that i was about to date but i ended up didn’t

That guy is also my childhood friend so he meant a lot for me but as friends and he has a girlfriend too and once a month we get together as the childhood friends like a group including him and me

We had a group chat and me and him talked closely kinda sexual but not like that we were just kidding and everyone in the group knew that i would never do such thing like having an interest in someone while I have a bf and when we met as a group and we talked about that chat I said hell nooooo I have the best boyfriend

Anyways me and my bf met yesterday at a cafe and he started to check my phone and he saw the messages and he just got up and left me there in the cafe i tried to explain that it was a joke (everyone in the group chat sometimes make these kind of jokes)

I got up too got after him he doesn’t even listen to me he is saying that i cheated on him he says that I’m a cheater and a liar and says who knows what we did when he was not around

Y’all I’m not defending my messages i know it was out of the line he is def right about that but I would never ever cheat on anyone It was a joke and he doesn’t even tried to listen he’s just saying fuck you, i hate you, you’re grossing me out

If you knew how much he was in love with me

He is right about the messages but thinking that i would cheat on him and that i would lie to him and saying all these humiliating things over just a text that he saw not even giving me a chance to explain

I sent him hundreds of mesagges called him hundreds times and the last thing I sent was

‘I never cheated on you, and never lied to you. If you thought I would do such thing shame on you. And if I ever cheated, I would delete my mesagges. So believe what you like and the reason that I’m sad is that you assuming bad things for me before listening to me It wouldn’t make me this sad If I cheated.’

Yall I loved him so much what should I do for him to believe me he doesnt even give me a chance to explain and if you knew what he told me

Fuck your love i regret dating you I wish I never met you you’re a liar I don’t wanna hear your lies never ever try to talk to me I don’t ever wanna see your face again

Please tell me what should I do he doesn’t believe that we were joking he doesn’t even wanna listen