My 2-year old son is not my husband’s. In 2011 I had a short but intense affair with a guy on my rec-league beach volleyball team. I was on the pill but every time we hooked up we had s** at least twice. In two months, we must have had s** over 50 times. I knew when I got pregnant, but the older my son gets I can see the other guy in him. He also looks so much different than my 8-year old daughter with my husband. Sometimes I’m paranoid he knows, but I don’t think he does. But then I feel guilty, and get horrified about genetic issues with health down the road. I don’t know what to do.