i been friends with this girl for just about 4 years and one day out of the blue she quits answering my text and does not call back at all so i go over to her house and i ask what is going on with her just being a good friend making sure she is ok and we start fighting, she thinks her bf has been cheating on her with me so i try to tell her we are just friends and we have never fool around so what should i do now,,,,

she is like my best friend, would you think i should just drop it or keep trying to talk with her about this

Find out WHY,,or HOW, she came to this conclusion?
THEN, show her what-ever facts you can to dis-prove her thoughts.
And to be real with ya,,,I have never had a close friend who WE COULDN'T talk about THAT and get to the truth,,yet NOT question that either could or would DO THAT to the other one...
Its just BS goes around,,and TALKS have to be expressed to NOT leave ANY opened chat shzt going around us or in the others mind..

If she is REAlly YOUR FRIEND,,,I FAIL TO think OR see,,,
why? sHE WOULD ever SUSPECT THAT you COULD do that to her??

Honesty,,with her is all you can do,,if THat fAILS,,,then she never was your real friend... Good luck...

Sounds like high school drama. She needs to grow up. If she doesn't trust you then she is not your real friend. She could be just looking for someone to blame for what ever it is. Let her cool down for abit and let her know to come talk to you when she's ready. If she don't, then yep, she's not that cool and just a child.

You need to find out why she thinks this, then you need to reassure her that nothing happened between you and her boyfriend. Personally, I think she is probably cheating on him, because alot of times when someone accusses the other of cheating, it means that they themselves have cheated and are feeling guilty for it. Not saying this is what happened, but wouldn't surprise me if it did.