STD Scare?

I just found out a guy that I kissed last year has herpes. Apparently he just found out he had it. (I ended up hearing abt him finding out through a friend.) As far as I remember, there were never any open sores or anything on his mouth that would alarm me and make me stay away. I never slept with him and I only kissed him twice, but I know you can only get it if it's active...I'm not and haven't been worried about it, but should I be?