I'm a big fan of letting out the resentment.
All kidding aside, get some shit in writing. Make sure you both know the ground rules from Day One.
Make a list of things that Will Not Be Tolerated. And another of Things That Must Happen.
Make sure you review that thing regularly. The honeymoon phase lasts for a while and then there are kids and other things to distract you. It's pretty easy if you don't have established rules for one or the other to grow complacent and forget why you married each other in the first place.
I survived a 25 year marriage that was contentious for a long time because we didn't have understandings in place from the start. I let her do and not do things that annoyed the fuck out of me because I loved her and didn't want to hurt her feelings by bitching. I'm sure I annoyed the shit out of her too. Now we are done with the ordeal and both happier.
Among the things I would suggest as non-negotiable:
1) Make time for each other alone. And not with any ulterior motives. If every time you take her out to dinner at a decent place or take her to your favorite bar together you're doing so hoping you can get up in that ass? Eventually ruins the whole thing for her and she will resent it.
2) Make sure you enjoy each other's company outside of the bedroom. It's a simple, stupid thing but if she likes to watch Chopped, Flip That House and Diners Dumps and Derelicts and you HATE those shows and the people on them? You got a problem, son. It's okay at first, but if you're in the mood to watch Law and Order but can't because there's a fucking House Flip marathon on? It's going to piss you off. You need to like the same kind of music, the same kind of bands, the same kind of food even. Do you know what it's been like for 25 years to have every motherfucking seafood restaurant ruled out from the jump? I love seafood, but could never go because she didn't like it. So we'd end up at some shitty Lone Star chain or something because "you can get seafood there.." Horseshit.
3) Have clear cut expectations about who does what. If you want to impress her by saying "no, I got it" every time the dishes are due to be washed at first? That shit gets ingrained and eventually that becomes your perpetual lot in life. Make a fucking schedule and share the chores. Even if it's as simple as "you do everything outside the house and I'll do everything inside."
4) Don't be an ass. Pick up your own clothes, don't leave messes laying around. If you make shit marks in your underwear, have the decency to wash that yourself.
5) Don't let the dining room table be the mail catchall. It's a hard habit to break, but just don't start it.
6) Make it a point to have meals together as a family, especially after you have kids. That hour or so at the dinner table is vitally important. It keeps you connected.
7) Take time to really listen to what she's trying to tell you. Make sure she understands what you're saying. Never assume.
8) It's okay to go to bed mad. Just don't stay that way. Whenever you argue with her always, always repeat back to her what she just said to you. "I'm pissed at you for leaving your shit stained under drawers laying on the bed..." and you go "Just to make sure, you're upset because my shitty drawers are on the bed, right? " And then offer a solution.
9) Don't try to fix everything. It's the male way to hear a problem and try to figure out some way to fix it. Women aren't necessarily like that. Sometimes they just need to say shit to get it out. If they've had a bad day at work and are pissed at their co-worker they don't want you to offer advice on how to resolve the issue or make plans to solve it for them. Sometimes they just want to talk about it. Nothing more. So listen and sympathize.
10) Tell each other more than just "I love you" every day. Saying that over and over becomes rote. Find something that you love about her every day and point it out specifically. I love what you did with your hair, or I love the way your mouth turns up when you smile like that will carry more weight than a hundred mumbled "love ya". Try to remember one reason you love her every day -- and tell her.
11) And finally, when you're sitting there in your boxers wondering just when it was that she changed, just remember that you've changed too. Make allowances for it.
You outkicked your coverage. Never forget that either.