So I stayed away many years. I still am under no illusion it could or did happen in my current relationship. Not that necessarily I've had clues but you would be silly to blindly believe. I don't stress don't ever get jealous, I never look in phones or cross examine if I find out I find out then deal with it, what may be may be but you might aswell play along in the hope you don't die alone.
I love the idea of a loyal life long bond no one can break with a lover but its statically daft to believe. And thats just taking the figures you know about not factoring in these things should really be a hidden secret.
Congrats on the engagement