Why does my affair partner keep showing me pics of his child?

You'll all judge me and slate me rotton but here goes. I've been having an affair for the past 8 months with someone who has a girlfriend and a child. It just happened and I'm sure people on here aren't innocent. I feel guilty all the time. But like I said... It just happened. But he sends me pictures of his child and him and his child. That just makes me feel more guilty. But is there a reason why he would do that?
Why does my affair partner keep showing me pics of his child?
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