And you only replied with "Happy Holidays"--very generic and have not "fed" him with any other responses. You ARE doing better this month/year.

Once upon a time, you took the time to get to know him (and vice versa) and he loves you for many of the same reasons your friends and family love you. It seems like broken hearts just happen sometimes when we are dating. When we are young, it is a time of exploration (we don't realize how consequential romantic relationships can be). You are married--he should understand why you don't reply and can no longer be his friend (because it is more than a friend feeling for him--you just can't feed this--it is unhealthy for him too!)