should i tell him?

[Anxiety]

The guy I'm sorta dating said no to going to a concert with me tonight, so I went alone. While I was there I met someone and he helped me out by keeping his hands on my shoulder while he was behind me so I wouldn't fall when the crowd was forcefully pushed from side to side.
He had to leave in the middle of the concert, and as he said goodbye he turned me around, gave me his number and kissed me. I told him previously that I was interested in someone, but he did it anyway, which I don't understand. I told the guy I like that I met him but I didn't tell him he kissed me or that I got his number.
He's a very protective guy and would probably be upset if I told him but at the same time I feel like I'm lying to him so I don't know if I should tell him..

[Krash9]

do you feel guilty for it happening? if it was no big deal for you then i think its no big deal if you dont tell him. if it got you like tingly or you call the number then you should tell him

[nevillee9]

Tell him. I've done stuff with other people whilst I was with my bf, I told him and I was very apologetic and he has forgiven me... If he loves you, he will too

[Gwen]

You didn't make it happen, that guy did it suddenly without you prompting or anything. Your choice to tell him or not, it shouldn't hurt your relationship if you didn't do anything :)

[Anxiety]

Yeah, I don't think I'll tell him. I mean, I didnt have any idea I was going to get kissed, and it'll probably be irrelevant to him if I told him now, cos I'm sure I'll never see that guy again xD

[workingatperfect]

You said you're sort of dating him, I'm guessing that means you aren't boyfriend/girlfriend or in a relationship yet? If that's the case, you have no responsibility to tell him, but you can and if you feel you should then by all means, do it. But if you're not committed, you have every right to hang out with or kiss other guys and whether you tell him or not is your business.

Again, this is only if you're casually dating. If you were committed/exclusive/etc. it'd be a different story.