Weird things with a friend Happening

I'll try to keep a long story short. It's a close friend and family almost situation. He is 6 years younger than me. My youngest brothers best friend. A longtime friend for me as well. He has been a dear friend that I have shared feelings of loss with and I have been there the same with some loss and tragedies. I had a sexual dream about him many years ago and dismissed because of my sexuality. In the last year or more we have spent a lot of time together in bad times and been supportive as friends. I had a friend of his tell me about how he tried to kiss him which I've said nothing about ever. I'm just spinning on what to do or say about it. His FB avatar is a picture of us in a friends pool with us together. Our conversations via text get sexual and graphic but followed by a smile face or a Hahaha but "Jokingly". My bisexuality has been closeted. He wouldn't tell anyone ever if I came out to him but I worry I would creep out my only close friend if the attracted feelings were not mutal. I would appreciate any advise someone has

 

The conversations gets homosexual graphic big time. I think I need to say something and see what happens. I keep wishing he would do the same. He wouldn't be hurtful or tell the world if I explained myself. It just feels like one of us needs to say or make a move. I'm close to just put it out there and see