Why would my ex choose a girl that gave him an STD over me?

He cheated on me with a woman with two kids, and gave himself and I an std and he still choose her over me, he said he can’t stand me because I don’t have his best interest in mind. I’ve cooked for him, taken care of him when he was sick, gave him rides to work. I haven’t been perfect but I never cheated. All I’ve been asking for is to be treated nicely, and he said he can’t do that because I am an A**hole, I’m only that way after he does some abusive stuff (he’s been physically and emotionally abusive). I know I shouldn’t want this person, I’m just baffled he choose her.

Why would my ex choose a girl that gave him an STD over me?
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