while I never had another BL with my YF, I did tend to get jealous when he used to play a little too obviously with one of his friends, 'wrestling' on top of each other and all kinds of sexually charged actions (pants-ing, skinny dipping in his backyard pool, etc). I suppose it wasn't exactly jealousy, more like a bit of sadness at knowing all these things were inappropriate for me but OK for someone his age. He would tell me about his 'adventures' with his friends, too (mutual jerks), and I had to just be a good listener, try to give advice/admonishment, and secretly wish I could have been born 6 years late.