Yes, to clear the air once and for all, you should have a matured conversation with him. If he is the person whom you want to spend the rest of your life with, are you sure that's what he wants too?

If he is who he is, then you should get out of the relationship. No point getting married to him when he has other men around him all the time.

But you know, it's funny, if a husband come home and find another girl in bed with his wife, the man would want a threesome. But if it was the other way around, women come home to find the husband in bed with another men, they find it gross. And if the catch husband in bed with another woman, that's cheating. Life ain't fair eh? For women at least ...

Now, it doesn't matter if he's sweet or not. Can you accept that he is gay? All else is irrelevant until you know what you want or can accept.