I had a college classmate who dated a man (for few months) whose wife was pregnant on a bed rest. When she started insisting that they can’t always meet in restaurants and parks and she lived in a dorm and that she wanted to come to his house. He then immediately stopped answering her phone calls. She found his address and drove to his house and that’s how she found out. She was so madly in love and none of us suspected anything.

I better stop. I know too many stories with similar outcome