There are two things that stand out, above : beyond watching porn (which I suspect the majority of men do, though I did honour with a man who didn't);
A. The frequency - you say it's every day. That's getting into habit/addiction territory. Lots of men watch porn but if it's not every day and its not obvious, it could be tolerated by those who choose to tolerate it.
B. Some men, believe it or not, do watch mostly just straight, "vanilla", sex and/or performances by favourite actresses - without focusing on gagging/deep throating, anal (aptly named Painal), and degrading sex acts. But you h is focusing on those. He'd also apparently tried to actually do them in your sex life. That's another level.
So it's not just watching porn, it's watching porn to excess, it's specifically watching degrading porn, and it's actually having tried/pressured to do sex acts that most women don't enjoy and that are degrading.
Noone needs a reason to end a relationship but the above is more than enough.
He's become porn sick, that's the bottom line.
And if he's watching porn every day, presumably he's not offering you much of a regular, healthy, enjoyable sex life. Another reason to give him the heave ho.
He's also given you the ick - understandably , so you probably aren't even as attracted to him, and know that during sex he might be fantasising about painful and degrading stuff, and not present & into normal sex with you; which is also a turn off.