You got hit with two dangerous events.
One, you got the taste of being married without the commitment. You live with her, she's nice to you, she fcuks your brain off.
This here is what you are looking for, this here is what majority of men on here is looking for even if they don't know or accept it.
It's natural for you to "fall in love" in this situation, you're supposed to. Mighty men have fallen to this, think Samson and Delilah.
Two, you built chemistry with a girl that was out of your reach.
Before you pulled your dikc out you knew she was in a relationship however the conquering instinct in men
motivated you to ignore every sense of reason and pound the beech. It's normal. We all want to conquer some pussie.
We all want to indeed get that which people say we cant.
How do you proceed?
You keep fcuking her. But more importantly you find another plate.
Believe me, you're not in love with her, of course you think you are, I would too but you are not in love with her.
Understand the juiciness of her pussie would make you want to "save her", you won't be the last to get burned if you tried.
Enjoy the pussie knowing it has an expiration date. And find a replacement fast before the expiration date. Do not try to extend the expiration date.