I just found out that my husband met a woman while "out with the boys", gave her his number, communicated, invited her out with her friends and his friends then exchanged calls again. I am livid and he is begging for mercy. Is this cheating?

Did he try to hide it from you? If he tried to hide it from you then obviously I think it's cheating. If it was just a friendly exchange between two people then I don't see it as cheating. But obviously you see it as cheating or some form of non-loyalty simply because you are so upset about it.

Do you think he would consider it cheating if you did the same with meeting a man while out with friends? Would he approve and be supportive of the "friendship"? Would he have mentioned it if you hadn't found out on your own? Would he have invited her along if you were present?

"Cheating" means different things to different couples. If it goes against what the two of you feel is appropriate behavior in a marriage, if it is done in secret, then many would consider it a form of cheating.

I agree with DouglaLC what's good for the goose is good for the gander. If he would be upset that you asked for a guys number then it proves it is not good. If he wanted her to 'hang out' with him AND his buddies then he should have handled it totally different and not given his number and made it on a more personal level. Maybe he meant no harm but he did use bad judgment at any rate.

I just found out that my husband met a woman while "out with the boys", gave her his number, communicated, invited her out with her friends and his friends then exchanged calls again. I am livid and he is begging for mercy. Is this cheating?
He asked for her number :( he already did cheat

I wouldn't consider it cheating, but is that all that happened? You'll never really know. Its suspicious behavior for sure and I don't blame you for being angry!

I like to think of cheating as a mental boundary as well. He definitely crossed a line that he shouldn't have. Has the trust been jeopardized for you?