Well, i have devised a very simple plan to solve your problem. If he doesn't want it to spread, he has his own reasons. You may need some advice - consider talking to someone you know who's gay and seems at ease with their sexuality. If you're in love with him, you're avoiding the emotional risks involved in finding a real relationship with an available man. If you begin to think in this way, your distress may subside, and eventually you may be able to move on from this experience quite naturally.
Listen when your friend talks and see what he says about other men.
Your problem -- well one of them -- appears to be that you're committed to a label that doesn't apply to you and your only rationale is that you haven't had pleasurable sex with "guys. Name and address withheld. Ah yes, unrequited love - it cuts right through all orientations Don't treat it as a rejection either, it's just a fact of life and you're not expected to know.
It's also possible that he just isn't gay and you are mistaken.