My girlfriend is pretty pissed of at me. I dont even really know what I did or said to get her mad at me though. She has really low self esteem, and because of that she gets jealous easily. And she's always comparing herself to other things, and saying how they're better than her. I always tell her that she's the only girl for me, but she doesnt seem to listen. She can be pretty mean when she's mad but I still love her and cant live without her....

It's a good sign that she gets jealous! It shows that you're not worthless in her eyes. If I were you, I'd just continue treating her like she's worth a billion dollars and tell her that the things she compares herself to is not worthy. Your continued love towards her is something that she will remember and hold onto when she loses everything and is at the rock-bottom pit of her life.

Sometimes just being there for her is enough to contribute towards her hard situations. If she's mean when she's mad, just back off for a awhile and disappear from her life temporarily. This way when she calms down, she'll notice something missing and start to remember you. This isn't a mind game, it's just giving her space to ponder and think.

Best wishes.