Straight Friend Mixed signals

[Justme]

I know this is probably the most common experience of gay men-- straight guys giving us mixed signals. So to think I still have to ask how to handle this...

He & I have been friends for about a year & have gotten really close in recent months. So close that we would talk every day, multiple times a day. He's 11 years older. He knew I was gay & he explained that he's straight. He literally talks about vagina all the time. He's tried dating several times. A couple months into the relationship it falls apart. Idk why. While being there for him, I sort of began to develop a crush on him.

I finally told him in April that I could no longer be his friend & wished him the best (he'd been seeing some chick and I was jealous). He was upset. Told me he knew I was liked him cause of how much I was there for him & that I was making a mistake. At that point, I felt used & didn't talk to him for a week. It was a horrible week. I saw him one day and we began talking. We explained how we didn't want to lose each other, but he reminded me that we're JUST friends. Nothing more. I accepted (I just wanted him in my life).

Here's where the mixed signals come in... Ever since, he talks about sex constantly. Brags on himself and asks me personal questions about what & how I like it. I'll change the subject & it goes right back to sex with him even demonstrating moves.
He sends me pictures of HIMSELF. No nudity. I know how he looks. I don't need pics. His reason: we're friends.
He does not want me to date. His excuse is he's gonna hook me up with someone, so don't get involved with anybody else-- romantically or sexually. I have yet to meet this person.
And lately he's been doing something that drives me crazy... He gets close to my ear & talks really low. While he's talking, his dick is rested against the back of my hand. Happened 3 times this week. And I know he feels it cause he's in those basketball shorts, which is like boxers without the hole. When I try to move away, he grabs my arm. Of course the voice in my head yells 'grab it' but for the reason of us being JUST friends, I won't.

I am really attracted to him, but for the sake of our friendship I want to respect his boundaries... Except Idk what they are! It's driving me crazy. Idk how to start up a conversation about it cause Idk if it's all in my head. I know his response is gonna be he loves pussy. I don't want him to feel like I'm forcing something that isn't there.
I also just drove 2 & 1/2 hours to & from the airport to get him. We went out to eat & our preparer thought we were a couple. Afterwards he invited me up to his apartment. He didn't say why. I declined cause I didn't trust myself to behave. I lied my way out of it, but I'm not a good liar, so he probably knew.

I just don't know how to handle the situation. Do I flat out ask him what's going on & risk the friendship? Do I come on to him the next time he basically rubs one out on my knuckles & risk the friendship? Or am I over thinking it & just continue to try to ignore everything to keep him as a friend? And if we're gonna be just friends, how do it explain to him that his actions are leading me on without spacing the friendship?