It does not make you a bad person! Luckily it is just a game, right?
Btw, something similar happened to me in TS3. It was the first time ever I played the game. I created a lovely sim. Her name was Lisbeth Devon. I wanted her to be a single mom so I had her go for a baby daddy hunt. She met Marty Keaton. Marty Keaton made my sim pregnant. My sim goes into labor. He appears to acompany her to a hospital. My sim has a baby. My sim takes her baby for a stroll. My sim meets Justine. Justine Keaton. What the?!?!?! Yep. Marty has a wife. I felt so bad and guilty. But you know, such mistakes happen IN THIS GAME. I do not approve this IRL.
