I think the way to fix the last paragraph is to switch the verb first. “You love me like a sister” to become “You cherish me like a sister” and then “But I love you like a man” to become “But I want you like a lover.” The phrase “to love you like a lover” is so awkward it defies thinking it up.
And yeah, one of the ugly corners of love. It’s kind of odd, love – the more one gives it away, the more valuable that which is given is. To be willing to give of yourself over and over again just is a hallmark of someone with a lot of heart to give. Kudos.