16 and absolutely in love. Worried about meeting two young as school complications are in the way

Me and my boyfriend have been together since we were 13 we are now 16 , turning 17 soon. Before we dated we were Bestfriends since we were eleven. We adore Eachother and we barely ever argue. We always have smiles on our faces when we are around Eachother and I know full well I'm in love with him. Of course we both know we want to spend the rest of our lives with Eachother but I feel like a part of him wants to also be in a relationship but experience the whole young adult boy phase of having sex with loads of women. We lost our virginity to Eachother and I'm worried he will also leave me or we will break up because of choices in collage and being away from Eachother and busy. Can anyway help me or give me confidence ?😭😭