In the past few months, I started noticing a colleague acting differently toward me. I see him every day and say hi, and he completely ignores me. At first, I excused it by saying he didn't see or hear me or was having a bad day. But, now it's obvious: he really dislikes me.

I have no idea what I did or say to make him upset. He used to stop by my office, talk to me, and was overall very friendly. It just seems like overnight things changed.

My husband thinks I should just ignore him and not let it bother me.

What do you think I should do?