K...little disturbed with the sex life sucks but you're learning to deal with it part but hey, it's your life so......

He never intends to marry you? hmmmm And by marry, is he talking about the whole legal ramifications marriage entails that he's balking at? Because if that is the issue....but he is willing to commit to you....you can have a ceremony that doesn't include an actual legal wedding.

(Lets try to forget for the moment, for his sense of legal leverage, that the longer you to are living together (I'm assuming you live together) you're lives are going to continue to be legally bound whether he likes it or approves or not. Time does that, and the courts are rather straight up on this front. Live together long enough and in some states you're common law...in others you've got the palimony issue etc.)

But do, let's not dwell on the negative.

Consider having a ceremony where you affirm your love for each other, your willingness to live and love each other excluding all others, etc....and exchange rings. This can be done by a friend, a family member..there is no necessity for it to be done by someone legally allowed to 'marry' you, so he shouldn't feel the pressure of that. Could be a good friend of both of you, you could ask to officiate.

If this is something agreeable to you, yet he still refuses to even do that much, in a non-legal, non legally binding ceremony....then yes, as the others said...time to move on. You're definitely young enough to do better.