Expectation

Expectations can ruin a friendship/love life if applied wrong. Be mindful of the struggles your friend or spouse is facing. Encourage each step don't question each step unless you are picking their brain in a confident way. The goal of life is to grow.

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There's nothing wrong with knowing what you like. If you not sure if your friend/partner is not on the same page, talk about it in the beginning come to a stopping point and move on together or apart.
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Recognize what you want and don't bend the rules for someone.(unless you believe in them)