Cheating?

Okay I went out with a couple of friends and one of the guys in the group was the guy I think is cute. Well I sat beside him and after a while we flirted then he made me laugh a lot and well it just happened we ended up kissing and I have a boyfriend and we have been going together a while. I've been told I have to tell him sooner or later but I feel so guilty and I want to cry. I'm scared to tell him but I have this little feeling he will have mercy on me cause he has cheated on one of his old girlfriends before. I'm clearly scared he will break up with me but I don't want to but I guess I'm an idoit for not think that when I kissed the other guy. But one of my guy friends said its not cheating cause all we did was kiss and I didn't go any further with him. But what do I do? How do I tell him? Do I have to tell him? Will he most likely break up with me? HELP please :(
Cheating?
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