"Can anybody tell me how not to fall in love when dating women?"
If you're the type that falls in love then you're the type that falls in love.
There's no cure for that.
Though I suppose you could try dating low quality women who you don't trust, that might shock your senses into not allowing you to fall in love with em.
"How do you prevent yourself from falling in love with a girl you like a lot ? I just want to have fun, no commitment, no love."
Either try my low quality woman idea or find yourself a prostitute.
You are simply the type that falls in love with regular good chicks.
Maybe embrace the love if you sense the girl is a good person.
It can't hurt you in that case.
"By the way, also, how do you fall out of love??"
Well if the chick gets too boring or her behaviour changes to not being what makes you happy that usually can do it all on its own. Anyone can get lazy in a relationship even chicks and they can lose their guys the same way ie being boring or letting their appearance go by getting too lazy and comfortable.