Why I shouldn't forgive a cheater

I guess I want some POVs on this.

Was talking to a friend about relationships and cheating and I said I couldn't forgive a cheater, and if I did, I'd probably become abusive.

I would constantly bring it up anytime she did or said anything that would make me think she'd cheat.

Want to go out to the bar? Well you cheated on me before, so I don't trust you to go out alone.

Making a new guy friend? Hey! Remember how you cheated on me?

Oh? I can't see your phone? Well, you did cheat on me, so...

I could easily see myself become bitter and controlling.

The worst part is that I would be pretty miserable myself. I don't want to constantly distrust my partner.

Also, I could see myself easily justifying my behavior.

To me, cheating is breaking the most basic of boundaries.

Maybe it's just me, but to me, cheating, no matter how long ago it was, or with who, or why you did it, marks the absolute end of a relationship for me. For both our sakes even, because I could see myself become controlling and emotionally abusive if I stayed.