Although English isn’t my first language, and I'm far from a grammarian, nevertheless here are some corrections, I think, you need to make, unless you're writing in a specific style that calls for these errors.

John is getting nut (?) every time he sees her online. Everytime Every time he sees her, he is thinking about her. It seems there is a magnetic that draws him to her. It is a power powerful temptation he is hardly to resist (?). He is very curious about her, yet he does not want to find out. It is not like those losers in movies that he is afraid to talk to any girls. (?) As a matter of fact, in life, he is pretty successful asking girls out when he is not busy. It seems that girls likes John. I do not know what it is. Probably it is his charm and intelgience intelligence that they like in him.