Loss of attraction

🙄... My guy & I have been together for 3ys now. We began as friends (about 8ys ago) that turned into something more. We were quiet about eachother not telling anyone if we were dating or what not. It was fun, spontaneous, sexy, adventurous etc. You tell people your business things tend to get messy. Anyway, we made it official and obviously everyone (our friends) knows. Their happy for us and so forth. Now for us, it's beyond different. If there is something wrong, I'd like to address the problem. He's not as verbal with his feelings as I'd like him to be but he's somewhat coming along. To me, he's sexy, beautiful and when I look at him I just want to jump on this man. Now if I initiated sex, he's obviously turned on as much as I am but once he gets inside me he's turned all the way off. This has been going on for months. I've asked him what's going on? What can I/we do to keep you in the mood? I get nothing but an I'm sorry. Yesterday it happened again. He's turned on and then it's like a deflated football game. He then says to me how would I feel about him taking viagra? He's 37 and gets very much turned on. I don't think he needs to. I just think he's not into me anymore. Now I'm a frustrated woman looking for some tips on what to do and/or say.

Gif says it all lol