It doesn't sound like he's very committed. I'd probably move on if I were you. Confront him about it. Find out if he's sorry. If he's not, I would say move on, but if he is, have a forgiving attitude.
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Hey... Well, I'm sorry to say, but you gotta end it. If he likes someone else, then he isn't interested in you anymore, and you gotta move on and find someone else. Just remember, it isn't your fault and don't get upset about it. Theres someone out there for everyone, and your boyfriend isn't 'the one' if he's sneakin around and lookin at other girls. xx
There are a lot of factors to think about if this happens. How much do you care about him? How much do you know he cares about you? Was it intentional? Was he honest? How long have you been together? Is he worth forgiving?
If it's the first time it may be the last. If it's not the first it probably won't be the last.
He may regret it. It all depends on how well you know him. If he's worth it, forgive him. If not, don't hesitate to move on!