It sounds like you’re jealous of his relationships with his female friends, all of whom he’s slept with and keeps seeing because he says they don’t mean anything to him. Hmmm…. I think anyone would understand why you’re unsettled. Guys who keep their exes around and socialize with them, create a very rocky road for any future relationships. As you know, sex changes things and when couples have sex, they are not friends. It would be one thing if he had an ex who is now married and wants to double date with the two of you, but if all his friends are women and all his friends have had sex with him, and he wants to keep it that way in spite of your discomfort then I think you have to be brutally honest with yourself.
Instead of trying to change him, ask yourself what is important to you. If you want a committed, long-term relationship that leads to marriage and children, can you have that with someone who keeps his exes close? Most people can’t. This is really about you and what works for you. It feels like you’re trying to hold onto him and the relationship, but not wanting to truly face this incompatibility. Exes factor into compatibility — whether they’re ex spouses or ex lovers. Just like step-kids and in-laws, exes can make or break a relationship based on compatibility in the way the two of you handle exes. The other thing to consider is that he may just not be ready for a deep commitment with you and keeping these exes around makes him feel less committed to you than if he was ready for marriage and wanted to put you on a pedestal and make it clear to the world that you’re the most important woman in his life.
I hope that helps.