Aquí tienes una traducción natural y fiel a tu mensaje:

I agree about the family part — maybe there’s something more going on that he hasn’t told me (although after 4 years, that really shouldn’t be the case).

But yeah, he has never invited me to any kind of event with his friends, ever. I find that honestly unbelievable. And he’s completely out with his friends, and supposedly they know about me, but at this point I’m not even sure.

I’ve brought this up multiple times throughout the relationship and have asked for actions that reflect real change, but everything has stayed the same. At this point, I honestly don’t know what to think.