im not sure but when I caught myself falling for someone I noticed that I would look for flaws in him I would search and search and I couldn't and I still cant find any and you want to be in a relationship with a guy you are good friends with first because if you havnt noticed you probally can trust your best friend and tell them anything and if you can do that with the person you like then I think that person is a great match for you and another reason you can tell if you are falling is that person makes you want to be a better person and you think about them every second of everyday you feel that you can be your self around them and they accept you so if this advice helps you out than that is cooler than the other side of the pillow kai-lee n.
When I first fell in love, I had a really sudden horrible pain in chest, like I've been stabbed. Then it really started to hurt and I felt like I was suffocating. My mind was going blank and I could only think of this persons face and murmur his name. I felt like crying. Well, that was back when I was like eleven and my friend moved away. That was when i found out I liked him.
Anyway, if you're a slowpoke and dense like me, you probably won't realize if you like someone till something like that happens. But some smarter people can figure out their feelings easier, i guess.