If the person is very close friend = YO TE AMO but if the person is only friend = TE QUIERO or ME GUSTAS

"I like you" translates to "Me caes bien". Unless you mean "I like you" romantically. Then you would use "Me gustas". "Yo te amo" = "I love you". "Yo te quiero" = "I love you". Sometimes like a very cose friend "loves" another friend. It's like casually saying "I love ya". "Me gustas" = "You are phyically / romantically attractive to me." This is the case in most Spanish speaking countries, but not all. To be safe, don't use "me gustas" unless you like them romantically.

depends on what you mean....i would not use what they have said above if i am not sure that this is exactly what i mean!

Yo te amo