Hi! Me again asking for dating advice.

I already asked a while back about having knee surgery and my Bf of 6-7months acting more distant during my recovery. So situation is still the same. We see eachother once or twice a week, sometimes he asks me out. we text a lot from morning to bedtime. He is caring I guess, we caress and snuggle. But the problem is no sex and, well, no passion... I miss that... I don't know if he is not attracted to me anymore or just got used to not having sex while I couldn't , if this is possible... (I don't want to think that he may have someone else cause I trust him...). I want to talk to him about it but I don't know how to start the conversation... I know there's more to a relationship than sex, but I want to tell him I feel rejected everytime he doesn't want to have sex... And I'm unhappy. And we need to either work on this or decide what we're going to do with the relationship... If we're going nowhere, we both need to acknowledge that and move on... He's going away for a few days and I'll try to sit him down when he returns and talk this through... Any advice on how to approach him? I want to fix it if possible...