Other than friendship, I’m not sure where the two of you stand. Are you dating or co-workers spending time together? If you are pressing for a relationship and he is resisting, that’s not a good sign. Something is holding him back, whether it’s past hurts or if he has doubts. If this is it, then imo, don’t wait for too much longer. If he knows this is what you want and he wants it too, then he wouldn’t take that long to initiate.