Two responses to this thread. First the "How do I know she won't or is not cheating"
I know her very well. A deep understanding of what makes her....her. A big part of who she is, is driven on loyalty and being loved. I knew her ex, and what he did to her. I know how her older male family members have treated thier women...and how she despises it. I see the women she has emulated after. It's coded in her. Most importantly, I remain her vision of ideal....better yet her idea of best. I maintain my physique, affection, and dependability.
The second response is driven for the idea that she could cheat.
Not in my bed. Not in my face. Not in my mind. Anybody with time in a relationship will tell you that if you give that specific insecurity thought...it's gonna consume you. I am not condoning willfull ignorance, but I would prefer to not be suspicious all the time.