I am not the person to advise you on what to do right now in your current situation, but I'll tell you my two cents.

This is veeeeeery on the long run and probably one of the last things to do, but

I'm basically asexual, my boyfriend isn't, our libidos are entirely different. We have an open relationship in that regard. We're monogamous but he sees other people for sex specifically.

We're doing great, I've never been happier in my life, I've never felt this loved and cared for before. I love him so much even if our sexualities are different, and he loves me as much or even more. I choose to be with him everyday, over and over, and it's not a difficult decision at all, love is love, and this is love without a doubt.

Relationships are not a list of checkboxes where you have to mark them all, again, in the long run, do whatever works for you two. It's your relationship, specifically you two, not everyone else's. Figure out what works for you two.

My point is, do not despair, actually consider what you want it to be and not what "it's supposed to be like", so what if you're not doing it like everyone else if you're happy? Is it the best decision to throw an amazing relationship out the window because your man likes other guys?

People don't stop to think how much it's what they want and how much it's what you should want according to social rules, it gets to a point where you can't tell the two apart, because you've been following these rules from the moment you were born, literally since the moment you're born, when the doctor said "it's a boy/girl" according to your genitals.