There's no 'supposed' to feel here... you feel how you feel. You have to run with your gut on this because while everyone can tell you how they feel, it's your life that this will impact.
You need to ask yourself whether you are okay with your partner using porn.
If not, you need to ask yourself why you ignored it - it's not uncommon, but you need to understand why.
Then you need to ask yourself if you can continue to ignore it, or if you don't want to anymore.
Does the type of porn matter? If it was random free porn from PornHub, would that be better than Reddit and Onlyfans? Where is your line here?
And finally, how do you feel about him, overall? Do you love him? Is the attraction still there, if you managed to go 12 months without sex?
You wouldn't be the first woman who had ignored porn usage initially because you wanted things to work out. I have a close friend who was adamant that all men watch porn, and that she could live with it... five years down the line, she couldn't anymore. She says her perspective on porn didn't change, but her circumstances did - they got married and had children, and she'd been concerned she'd run out of time for that if she left him first off.
It also wouldn't be the first relationship where the porn use has gone from being "acceptable" to not over time. Like anything else, it's a habit than can level up. It's not uncommon for people to go from free porn to more unusual niches, or chat cams, or Reddit, etc.
For me, a year without sex would have been a dealbreaker anyway, if there's been no reason for it. Obviously, if DH was unwell or injured or something, we'd make it work, but we wouldn't have the relationship or the marriage that we have if neither of us wanted sex.
My concern with the two sites you've mentioned is that they're both more "interactive" forms of porn. I'm presuming that you're talking about the subs where people share photos and videos of themselves or their partners... and Onlyfans is Onlyfans. While that can be more "natural" porn, as it's "real" people, it also lets you get a lot closer to the person in the videos than conventional free porn... and that'd be a bit of an issue for me.
But you have to answer the questions yourself, so you know if this is worth saving, if you want to save it, and how you'd need to do that. And then you'd need to talk to him to see if he feels the same (unless you decide you don't want to stay, that can be a unilateral decision).