I agree with Sima. Whatever you decide to do, make sure you're aware of all the factors that are/have been involved, like his intentions and feelings all throughout. It could be hard to defy our first instincts which may urge immediate rejection and/or revenge. If I was in your situation, I would have a thorough discussion with him, one where our true feelings and thoughts are brought into the open and shared. Try to not allow your emotions to get the best of you. You never know, if you persist and give him a chance to explain, the outcome could be completely different than if you were to close your eyes and walk away from him.
Does the age difference bother you? It seems that your mere mention of it may imply some discomfort lurking in there.
Best of luck to you!!