Is it normal to grow obsessive feelings for your best friend?

I have a friend whom I have been very close to for the majority of my life. Recently, as of a few months ago, I began to gradually start viewing him in a different light. For so long I never saw him as more than a friend (I.E. constant figure in my life whom I could talk to anything about. He was always just THERE, like how my house will always be THERE or how school will always be THERE, just an inescapable fixture that I'm entitled to have). And then one day, it's like I stopped seeing him as a "fixture" in my life, and started seeing him as a PERSON. Someone who lives, and breathes, and eats and sleeps, and who is somehow always there for me when I need him.

When we're next to each other like sitting down on the couch watching a movie or whatever, I watch him breathe in and out, toss popcorn into his mouth, make stupid jokes while the movie is playing, and sometimes I couldnt stop myself from reaching over and pulling him into a hug. I love the surprised noise he makes when I pull him towards me unexpectedly, I would smell his hair as it fell into my face, hold him tight until I could feel his body heat merging with my body heat, and I would think to myself "This man is mine. He's sitting here next to me, this real life living breathing PERSON who's biggest concern is being with me and making me feel happy and safe, and he's all mine." it's like I can't believe God put him here, like God put him on this Earth just for ME.

I felt a lot of shame for my feelings towards my best friend. So for his sake, I began to start distancing myself away from him. Would "forget" to return his phone calls until a few days later, I'd get his text messages and not reply, but I would read them obsessively over and over and over again.

He makes me feel warm inside. When I'm in bed alone in the dark, I lie awake for hours just thinking about him, and I feel my heart tingling in a way that sort of hurts but feels so good, as if my heart is opening up, the way a flower opens up in the spring underneath the sunlight.

After a while of mild contact from me, he realized something was wrong. He tried asking me on Messenger if there was something the matter but I would wait like 15 minutes every time he asked a question and then I would reply with some short curt answer like "what do u mean?" He replied "I don't know, it feels like you're pissed at me or something" and I replied with a small "lol" then ignored the conversation while checking over and over again for a new message.

Please someone, tell me what's going on. Am I gay? I haven't looked at a girl in months now, but the thing is, I haven't looked at another guy either, ever. I've completely lost interest in everybody on the planet except for him, my own personal living breathing best friend who would do anything for me just out of pure love. It's like I can't believe he even exists, and I feel like we exist to be around each other.

Re: sexual thoughts, I guess I've had them, sort of. I haven't thought about his dick yet. Most of my "fantasies" are of me kissing all over his face, kissing his fingers, and kissing his stomach, but when I try to imagine going down further, the image just goes away from my head coz I don't think I really know what to do with sucking dick and all that. So far I just want to give him soft feather-light kisses all over his skin.

Is it normal for your best friend to consume every thought in your brain? Is it normal to want to be with one guy but have no urge to look at any other men (or women anymore)?

Am I gay? Am I TURNING gay? Have I been gay all this time and not known it, even when I would masturbate to naked women? Am I somehow straight but falling in love with my best friend? Is it normal to think about how perfect he was made? Is it normal to think that God made him for me? Please someone tell me what is going on because I'm tired of jumping one reason to another. I just want to know what is wrong with me.