What do I do about this difficult relationship?

Radostin Petrov says:
I think I must start with the fact that I'm a teenager and these things happen a lot to people at my age. I've been in a relationship with a girl (I'm a boy) for 4 months now being both happy and sad with it(mostly because I'm extremely jelious). I also am really egoistic and i know it. There' s another girl that has caught my interest who i am sure about 70% that likes me back but my girlfriend is really jelious of her. I would really like to spend more time with that girl but i think i may have had a bad influence with my gf and last night she even cried while we were on the phone that she is afraid to lose me and wants to be with me forever. I dont know what to do now as i certainly dont want to hurt her. She as well as the other girl is from my class and i am afraid that even a bad look from any of them caused by any reason would kill me inside. I know i act really selfish i just want to know how to get through the situation.
P.S. today i saw the other girl (not my gf) in the bus

To your credit you have been very honest about yourself - you have admitted you are jealous and hypocritical, but you have also shown a conscience and a desire to do the right thing.

I don't think anyone else can decide your next move for you, but these truths may guide you.
1. Relationships must include trust - no trust, no relationship, just a mess.
2. Often to do the right thing involves hurting someone's feelings - that musn't stop you doing it.
3. Always be honest with yourself about what you really want. Don't go for what you think you should want instead of what you really want - that will just make you unhappy.
4. Don't ever let fear determine your actions - you will feel fear anyway, so feel it but do the right thing regardless.

Good luck - trust what your heart tells you.