What would you do if a guy you have been dating flirts with your friend?

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Okay here is the situation you have been seing this person for 2 years, you have been keeping the situation pretty low key, so not a lot of people actually know that you are dating. I guess you could say it is an exclusive relationship in some ways. I guess that too needs explination. Though you are free to see whomever you would like to outside of the relationship there are rules of engagement so to say. anyway you are 2 years into this, and your friend calls you to tell you that they guy you have been seeing gave her his number and would love to take her out sometime. Do you confront him with this information that you have? Do you automatically believe your friend? do you call it quits for this 2 year long understanding thatthe two of you have had? Second part of the situation, lets say you confront him about it, he tells you his side and it doesn't match was she says, but then she changes her side to what he is stating, this to me means he is the one giving you the truth, now what does that bring to the table. You have on one hand a friend that you have had for years that can't seem to give you the story without fabrication, on the other hand a guy you have been seeing for years giving you the truth, what do you do? do you end the friendship and the relationship, do you end one and not the other? Crazy I know. I want to see how you all feel about this, this situation happened to someone I know and i don't know if i would have done it the same way, can't wait to see what you all have to say.