I have a serious problem with porn

I don't know if this is the right place to put it, but I didn't think anywhere else was right for this.

Anyway, for quite a while, i've looked at porn and hentai and fapped to it day after day. Although, all that time I felt like it was wrong. But I had no reason to stop, and I was lonely as shit so there wasn't really much supporting my need to stop.
But recently I got a really nice girlfriend, and I feel like it would be the right thing to do to just stop. But the thing is, I can't, and I feel like a complete dick because of it. I've managed to stop looking at regular porn and just fapped to ecchi, but even then I slip up sometimes. I've tried over and over and over but I just can't stop. I don't want to screw it up between me and my girlfriend. And I feel like i'm being really unfaithful. So, if anybody could please help me with this problem, it would be greatly appreciated.

And don't post shit like "kill yourself" or "chop your dick off". I'm asking for help and this is the only place I can turn to right now.

It's just an attitude thing, seriously. I can prove it. Ask some other girl if she cares about a guy doing that. What if she says yes? What if she says no? See, it's different with each person. In other words, it's a preference thing. It isn't "unfaithful" if she doesn't mind. It's purely what the two of you make of it. Even sex itself can mean nothing to some couples. It's all attitude.

There's no adverse effects of fapping, unless it affects your performance in bed of course, so it's only a preference thing in the end. And that's up to you. You can change your opinion over time. God knows we've all grown accustom to fapping here on 4chan, so you can change your opinion again, if you deem it necessary.

However, stopping it will be good in some ways, so weigh the outcomes and go for which is the best for right now, and for the future. If you plan on staying with someone who hates porn you can give it up, if you try. Or you might stay with someone who doesn't mind. When you're in your twenties like I am, you look back on decisions like this and realize that it's all part of growing up. Everyone learns and changes, so don't worry, it's quite common.

To answer what likely feels most troubling to you though, stopping gets easier once you've gone week or so. The less you think about it the better. Shift your focus to her, eventually it can change. Give it time and don't worry about slip ups. Guilt is almost always less useful than decisive and purposeful action.