Should I stay with my boyfriend even though I know he has cheated on me before with his wife (they are separated not divorced yet)?

I have heard from multiple people that my boyfriend had slept with his wife when we were nice and let her stay with us (not my choice). She had even told me but she is a pathological liar so idk if I believe her. Idk what to do I have no job and no one to take me in and I still love him I just don't know what to do

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