Is it wrong of me to think he is cheating? Should we break up?

Chelsea
My boyfriend and I have been together just shy of 3 years. He has recently gotten to where he is always picking fights, intentionally making me mad, starting to only come over when he is drunk, goes out to the bar with "the boys" and then calls me while he is there and starts listing off a lot of girls that are there that were not previously mentioned. He refused to be with me New Years and went to a party instead after fighting all day. Our fights are starting to be more than tiffs. I just don't know what to do anymore. He makes me so happy until he started doing all this. (All this started in the last 3 or 4 months)

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