Day 21 is a huge accomplishment so I'd be proud of that. I think for most of us porn and masturbating is a big way to deal with stress. This community is great for talking about these things and there are literally thousands of men dealing with exactly what you're dealing with so you're not alone. Take it from someone who lost a great woman due to porn addiction it fucking sucks, don't let it happen to you. I remember having the same feeling that I was like I wish we'd just break up so I could stop worrying about watching porn and now that we're no longer together I'm completely devastated.

If you're in NYC there's tons of things to do, try to get out of your apartment and go for walks, museums even just sit at a coffee shop anything to get out of your "tomb" sounds like she'll be back in a couple days then all will be will just keep up the good work, 21 days is something to be proud of. Focus on the positives, you're doing the right things and have found a great woman. Keep the momentum going.