Romance

I am looking for book I read about 20 years ago. I thought it was written by Sandra Brown but can't find anything like it on her website. What I remember about it is I believe they were college students. The male is from a wealthy family. Believe they have a one night stand. She gets pregnant. His parents convince him to marry her until baby is born then they divorce and he goes back to his fiance. Keeps visiting his son and starts realizing he doesn't really love his fiance and ends up falling in love with mother of his child

I believe the book is Separate Beds by LaVyrle Spencer.

That's the one. Thank you