That’s like asking why someone cheated on you. It don’t matter fool. Doesn’t matter where it originated from now, it exists. And its existence means you cannot coexist. She should’ve been proactive when she felt there were issues and did that self reflection herself and then brought it to him, not AFTER she let the doubt set in and deteriorate the relationship. Accountability is something you dudes don’t ever hold women to.So you didn't bother to find out what she was actually feeling, where the feelings stemmed from, etc.?
What's the point of committing to and living with someone if you won't even bother to investigate the root of a problem?
Or, do you know she's cheating and just leaving that out?