It's hard enough learning how to be a good boyfriend, but when you're a teen it's even more difficult because your hormones are raging and you don't have much practice.
Steps

1. Girls do not like guys who constantly lie to impress them. Tell the truth and you'll never have to worry about getting caught in a lie.
2. Be protective, but not to the point of being overprotective.
3. Make an effort to get along with her friends. Do not make it seem like your flirting with them. Your girlfriend could easily be hurt by this.
4. Respect that some of her friends are guys. If she says they're only friends, believe her unless you have a real reason not to.
5. Make sure you treat her well in front of your friends. Don't ignore her. Respect the fact that girls need to hang out with their girl-friends. Don't be jealous.
6. Answer her phone calls...and don't complain that she woke you up.
7. Compliment her often so that she knows that you're still interested in her. It will make her feel secure.
8. Tell her she looks beautiful when she's made an effort. Tell her she's beautiful when she hasn't.
9. Make sure she's always smiling. Make her happy when she's sad...but let her be sad if she needs to be.
10. Don't try to make her jealous, or suggest that she is jealous. It will get you dumped.
11. Don't be overly competitive with her. Girls like to think they're right.
12. Buy her flowers. But respect the fact that she won't carry them around all day. Not just any flowers. Make an effort to know her favorites.
13. Be romantic, but not cliche.
14. Don't get into fights. Girls won't see you as a protector, they will see you as an aggressor.
15. Don't tell her you think other girls are hot, even if she brings it up.
16. Let her play with your hair - even if she's messing it up.
17. Don't be jealous about her exes. She's with you, not with them. Never talk about how great your ex was. Unless you're saying that she's even better. and even then, you're on thin ice.
18. Don't embarrass her. EVER.
19. Don't pressure her.

1. Don't tease her about her outfits - she's probably self-conscious enough already.
2. Never call her fat - even if she's obese. Tell her you love her woman curves.
3. Don't tell her to get off your lap. Let your leg fall asleep. You can ask her to move her weight to the other leg.
4. Listen to her music even if it's rubbish and you can't stand it.
5. Listen to her even if the topic is boring.
6. Think before you say anything and don't do anything you'll regret.
7. Don't let your friends pick on her. Stick up for her, even if they are only kidding!
8. "No" always means no. even when you think it doesn't.
9. Don't ask for money from her or let her pay for lunch. Remember to be a gentleman.
10. Try to do something you both love to do, so that relationships don't seem a drag to you.
11. Tell her you've been thinking about her all day.
12. Kiss her on the forehead and on top of her head, especially when she is feeling down, and always say a simple 'I love you'. It will make her happy.joozone.com