My friends told they saw my girl friend in some place with some other guy and my girlfriend is not accepting it and I doubt my friends are true I needsome advice

If she denies it and you doubt what they say, I would forget about what they told you.

Don't believe most of what you hear from third parties. They could have seen someone who looks like your girl or even be making up a story just to get to you.

Even if it did happen it could be an innocent thing like being with brother , cousin ,uncle.

So u say that I can believe my girl friend?

Or perhaps it was someone who looked like her.

Either you believe your friends or your girlfriend.

No trust no relationship.

Me and my girl friend keep on fighting always for some or the other,because of our fight we both are always in bad mood and because of that we both lose concentration in our studies as well as in daily life,we both score very less marks in our exams due to our fight and we have broken up many times because of our fight pl tell me what should I do to stop our fight pl you people are only my last hope pl help me in this...

You are trying to force things with someone whom you are not that compatible with, it seems, and maybe you should back off, and let each other take care of their own responsibilities.

Its never a good sign when you are with a partner you don't get along well with, or bring out the worst in each other, and it causes other problems in your life.

You may have to face the fact that this ain't working out, and maybe it should end.

If you spend most of your time fighting I would say it is time to step back and evaluate the relationship.
Do you fight about differences in morals and beliefs? Or do you fight over little things that you just find irritating about each other?

You need to do some serious communicating and see if you can work these out. Because spending most of your time fighting is a banner saying fix this or end it for the good of you both.

We fight for silly things like not telling goodnight or if I talk with a girl or if I call a girl she will fight..

Some times you may love someone but that does not mean you can live with them or even be able to spend much time together.
When you have conflicting personalities or attitudes that constantly flare up over little things, how are you going to deal with the major problems that crop up in all relationships?

If you cannot calmly communicate your feelings and expectations about each other, and stop the constant fighting , it is time to end the relationship before the damage gets to be devastating.

Love would be easy if you could choose logically who you fell in love with. But that isn't the way it happens.

Sounds like you have deeper issues that you're camouflaging with petty indifferences, you need to either find out the real problems or face facts you just don't cut the mustard as a couple.

Compatible couples rarely spend time bickering over little things like not saying good night etc, because they say goodnight as a matter of courtesy.

They also spot problems and deal with them asap.