Why do men cheat?

I been with my boyfriend for 8 months, we moved in together and all the money is in his hands. He cheated on me not to long ago and the girl that he cheated on me with her boyfriend has seen the messages but didn't say nothing. What am I doing wrong? I say home and take care of my daughter and make sure the house is clean and he just goes out and cheats on me even tho he wants to settle down, he is also believing bullshit.
Why do men cheat?
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