My friend is lesbian and I think she likes me, what should I do?

Please serious answers. This girl is my best friend, and I don't want lose her. I think she's lesbian because for example

when we watch movies together she often choses movies with gays or lesbians.

She looks at me strange when we are in swimmingpool

or happened 2 times that she kissed me on lips

sometimes she comments other girls like " What a hot chick!" ( but she comments boys too)

and she is very beautiful girl and naver had a boyfriend.

do you think she can be lesbian or this doesn't prove anything? and what to do, should I talk with her?

My friend is lesbian and I think she likes me, what should I do?
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