Caught my son(16) kissing another boy(18). Plus I would love to fix our relationship. Independent events by the way.

My wife and I have two teenage kids: a 13 year old girl and a 16 year old boy. Just recently I came home after work to find my son kissing his best friend in his room; he didn't see me. Both my son and his friend has always been the high school jocks, he had girlfriends before and broke up with the last one 7 months ago. Both of them are on the football team and are together 24/7. I would say over the course of this past year, him and his friend have spend a lot of time together.I didn't say anything until his friend left. I did talk to my wife afterwards.
Lately, it seems all we've been doing is butting heads. More than usual and it's been affecting our relationship. Now he barley acknowledges me anymore. As a father it hurts when your son doesn't want anything to do with you. I know he's 16 and it's just the age group but I feel as though I'm not close to him anymore. He's very close to his mother and she brought it to my attention that he's starting to hate me- his words to her were "It's gotten to the point where I don't know why I hate him so much". That broke my heart. To hear that my son hates me and thinks I don't care about him. I'd like to add that he told my wife about him and his boyfriend months ago. Both of them broke up with their respective girlfriends, so they could be together. Matter of fact, my son has met his boyfriend's parents. It physically hurts me that I'm unaware of what going on in his daily life
I love my son no matter what. I don't care if he's gay, straight, bi, white, black, yellow, red. I don't care. All I want is for my son to be happy at the end of day. It hurts me that I'm not close to him anymore. It kills me to discover he basically has a whole another life that I have no idea about. I want my son back.
I don't know how fix our relationship. He refuses to even talk to me anymore. Heck I'm lucky if I get a "hello" and "goodbye". They're nights that I cry thinking about what our relationship once was and what it's now become.
TL;DR: I desperately want to fix the relationship with my teenage son


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