ONE OF HIS SWEATSHIRTS, and a really PRETTY RING. Even if it's not a serious relationship.
13. Make sure she gets home safely as often as you can. If you're dropping her off, walk her to the door. If you aren't dropping her off, call to be sure she's home safely.
14. If a guy is bothering her, it is your right to beat the shit out of him.
15. If you're talking to a female friend of yours, PULL YOUR girlfriend closer.
16. NEVER, ever slap her, even if it's just in a joking way. Even if she swats you first, and says, "Oh, you're so dumb" or something, never make any gestures back.
17. Go to a chick flick once in a while. She doesn't care whether you enjoy it or not, it just matters that you went.
18. You're dead meat if you can't get along with their pets, parents, and best friends. Be prince charming to their friends, Mr. Polite to their parents, and make sure to be nice to their animals.
19. Don't flirt with their moms...that's just freaky.
20. Don't be freaked out by PMS. It's not gross, and it really does make them feel like shit, so be understanding.
21. If you don't like the way they drive, you do it.
22. If you're officially dating, and you're introducing her to your friends, you'd better damn well introduce her as your girlfriend.
23. Don't stress where you go for every date. They really only want to be with you.
24. If they complain that something hurts, rub it for them without being asked.
25. Girls are fragile. Even if you're play fighting/wrestling, be very gentle.
26. Memorize their god damn birthdays. You forget her birthday and you're basically screwed for life.
27. Don't marinade the cologne, but smell good.
28. Don't give her something stupid for her birthday or Christmas or Valentine's day. It doesn't have to be expensive, but it has to be meaningful.
29. If you think the relationship isn't going to last, don't wait to find out. It will only hurt her more if you draw it out.
30. After you've been dating for a while, realize that they really have started to trust you. When you have a girlfriend who truly trusts you, you have a lot more responsibility, privilege and control than you would think. Be careful with it, most guys would kill for that kind of power, and it can be lost in a nanosecond.