Dear Prudie,
I'm a 26-year-old guy in graduate school who has been dating the same amazing girl since college. We get along great, rarely have any serious fights, and just purchased a house together. I plan on proposing soon. One night at a party last spring that my girlfriend couldn’t attend, I ended up drinking too much. I crashed at a friend’s house and slept with a female friend of his. It was the only time I strayed outside of my long relationship. I spent the next couple of months feeling horrible about this. However, taking advice you had provided in the past, as well as not wanting to destroy our whole relationship over one mistake, I decided not to tell. But the girl I slept with contacted me to tell me she was pregnant and keeping the baby. She slept with two other men, unprotected, the same month and is not sure who the father is. It’s important to note that I did not, um, finish with her that night. I'm now living a terrified life every day knowing that this could destroy everything. Part of me wants to just wait until the baby is born; if one of the other guys is the father, then I can move on with life, I suppose? But if the child is mine, everything is ruined. What should I do?