Is it normal for him to jerk off to me constantly?

i can see it happening but i'd exercise caution lol, he seems a little too honest and horny
i have too little experience to judge properly though

Nope, forget about this guy! He's probably lying about his marriage, and he's obviously interested in only one thing. Why would you want to get involved with a lying sack of shit who is a two-timing man-whore wannabe? Do you really want the karmic fruits of being a homewrecker in your life? Forget about this piece of shit, and ghost his ass!

Don't be a desperate, pathetic loser who is fine living a shitty lifestyle! Forget about this piece of garbage.

First, you'd be stupid to take what he says at face value. Maybe he's an unusual guy and what he's telling you is all true, but I think you'd be stupid to believe that he's actually going to leave his wife. Once you can visit him in a new place where you can see that he's unpacked and settled in for the long-haul, then you can begin to allow yourself to believe he's really left her. Until then, you should assume that it just ain't gonna happen.

If his "tribute" pictures amuse or arouse you, then what he's doing is fine. It sounds like you're really got his motor running, and I guess you should take that as a compliment at the very least. If he's comfortable sending you explicit pics, that's fine, but - for very obvious reasons - I think you'd be very unwise to be drawn into returning the favour. If he starts to pressure you to do so, then I think you should see that as a red flag.

As for how often he's masturbating, well, frequency varies a lot between guys, and there are lots of factors that influence that. If he has a healthy libido and he really hasn't been getting much from his wife - or he's just bored with her and doesn't find her sexually attractive any more - and you're his first fling, then it would be understandable if he's feeling particularly lustful after meeting the woman of his dreams.

Creepy.

the whole story is not normal.