Tips for an established LTR:
1. You
1. Don't get lazy.
2. If you were in shape when you first met her, stay in shape.
3. Keep dating her. At some point you'll probably have to plan date nites.
4. Don't care more about the relationship than she does.
5. Don't put her on a pedestal.
6. Don't tell her everything, even tho you feel close to her and trust her. There are some things they just don't need to know.
7. Lead. Plan most of the fun things. Set the expectations.
8. When she tries to get you to do something for her, tell her no 25% of the time.
9. Go out with your boys.
10. Keep doing your hobbies.
11. Piss her off every now and then. Do something dumb. Apologize Later. (One time I told my LTR that my crazy ex was the best lay ever. I hurt her feelings, but you know what, my LTR turned it up two notches in the bedroom.)
12. Never be afraid to walk away.
13. When she acts up, don't get drug under the bus. Keep your emotions in check.
14. Take away attention when she acts up.
15. Realize women are great actors. They are on their best behavior when dating. Once they tie you down, she will begin to show her true identity. And it never gets better.
16. Plan random and fun adventures.
17. Give each other breathing room.
18. Get to know her family, and make sure she knows yours. You can learn a lot about who she is by interacting with her family members. The apple never falls far from the tree!
19. Don't stop doing you.
20. Don't let her get too comfortable.
21. Every now and then let her know that some hot girl was hitting on you. Its even better if it happens in front of her.
22. 30minutes of time on the phone at the end of the day is always good when you aren't living together.
As a guy that has experienced every type of relationship possible more than once. The best deal I've ever had was an LTR where she did not live with me. Reason being: Things stay exciting. You have more freedom. Less complaining you have to listen to. She tries harder. She acts better. She doesn't gain weight. Less arguments. She is more compliant. The secks stays hot. You get the best of everything, with out a lot of the drawbacks.
Just remember What Uncle Howie said when she tries to move in with you and you are tired of going back and forth between each others house.
If I ever split with my current LTR, I will never have another one live with me. It sucks some of the fun out the relationship.