Sorry. But the law of averages say that a man who is jealous of another man does so with the ultimate goal of a sexual relationship. At least, that will be a part of the equation.
This isn't necessarily a bad thing, nor does it necessarily mean that he is a bad person. Nor does it mean that he could not have loved you in a mature way . . . a way that keeps improving and growing. Therefore, I wouldn't necessarily feel good or bad about it . . . it is what it is.