Woah.....his comment about that not being cheating would be a HUGE red flag for me. What exactly does he define cheating as? If he doesn't think that is cheating is he doing that in your own marriage because he chooses NOT to define it as cheating so it's ok? If he were my H no matter how short of time we were married he would have some serious answering to do.

Sounds like you are both on different pages when it comes to the definition of fidelity in a marriage. Something that should have been resolved before marriage but since it wasn't it needs to be settled NOW.

You probably could have handled the situation better if you hadn't become emotional BUT no matter what, there is a serious definition problem that needs to be resolved.

He walked out on you for that....I think the comment on cheating was the problem not your emotional outburst. If he had just respected your question & answered you instead of becoming defensive it never would have escalated to that point. There is something seriously WRONG with this picture that needs a resolution. Don't let it be the elephant in the room that no one talks about.....or it will haunt you the rest of your marriage.