I just called my boyfriend and heard a chick laughing the background, what do I do?

ok it is 12.19am ,i just called my boyfriend trying to tell him of some horrible news I had just received and he picks up and hear some chick laughing in the background. She says, " lol is the (insert my name)" and starts busting into hysterical laughter. I demand that he tells me who this girl is, as I get angrier and angrier, he just replies with" I will call you back later, no I will call you later" I am so angry I just hang up in his face ( partly because I am angry and partly because I am in shock. Half of me wants to get in my car, drive to his apartment , and beat his ass and then beat the chicks ass. But I am non violent, well until now .lol what do I do? why is this whore in his apartment this late when he told me he was tired and heading to bed?
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now he calls me this morning and tells me that it was his ex and that nothing happened last night, and that there is nothing going on between them two.but that he needs to talk to me and explain some things to me.what the hell
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he's been blowing up my phone, I am not trying to side with him at all but I do remember him telling me a while back he had to take care of a $700 tab his ex ran up and refused to pay for. could this be why he met her after he got home from work that night?
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i am just trying to think logically about this whole thing, and make a rational decision. But he told me a while back that he put her on his phone plan when they were dating back then and he just recently canceled it because she refused to pay.
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I joked with him and told him to go give her a good slap in the face and make her pay what she owed him. He told me not to worry that he would take care of this situation. Maybe that's why they met up after work, but who know we will see when he explains
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ok this asshole talks all day about how he is going to explain things to me.he comes over after work and jokes around, his explanation was that she just called and showed up and that he was trying to get her to leave, BULLSHIT, I kicked him out
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if I were in his shoes I wouldn't be joking around, I'd be trying to explain quick.he left class for trash and he can stay with the dependent, childish, loud, and obnoxious whore. I am cutting of all contact with him.
I just called my boyfriend and heard a chick laughing the background, what do I do?
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