if you are then it means you're not truly falling in love but just feeling attracted because love is a bit less pretty, it involves certain sacrifices and like seeing not so pretty things about the other. What to do? just look at the other person closely, surely they have flaws and ways of thinking that wouldn't match your personality. If it is a good person though, you better keep them!
Get older. The passage of time. You are at a young age, perhaps, where evolution has tuned your brain to fall in love so that you will want children while you are still young enough to have children.
Think like a man.....
Nothing. That's the part that sucks
make your self scarce, but then you don't live