I think i am in love with my best friend...should i propose her now or wait???.

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as you know its hard to keep all my love to her inside.i am in love with wit my best friend.she has been my friend for 2years when we were in college.we have more things in common and she respects me for what i am .and i feel very much happiness with her.she has many friends but she always keep all and cares for all her friends this makes me more difficult to tell her about my love.i have told her that i love to marry you so we can be friends for ever but she smiled at me and give slapped at my face passively.tell me friends have you ever been in such a situation .what should be my next step.