Number 1 is the normal way to express the idea that "you" are doing the loving and "I" am receiving the love and "you" are the only person that I need to do this.
Number 2 is grammatically incorrect. "Have" here could be interpreted in multiple ways and I started to type in a list of them, but it gets out of hand. There are so many ways you could say that a sentence could be correct if you changed this word or that ending.
Number 3 is awkward. It could be interpreted as "make" being passive, so that the sentence essentially means, "You are the only one that I need to make love me", i.e. you are the only one that I have to force or convince to love me.
Numbers 4 and 5 are grammatically correct. They seem to me to use more words to express the idea than necessary, but whatever.
If you wanted to say that "you" are the only person that I need to enable me to love myself ... I guess number 1 could be interpreted to mean that. As an isolated sentence, few would read it that way. In context it could have that meaning, but I'm hard pressed to come up with an example where it would not be awkward. If that was what you wanted to say, I'd say something more like, "You are the only person I need to help me to love myself".
Best Answer
When you're supposed to do something, you're expected or required to do something. In your example sentences:
"You're supposed to stop when at a red light" carries with it a variety of meanings and implications: "You are expected to stop", "According to the rules of the road, you must stop", "The police may catch you if you do not stop"
"You're supposed to unpack once you get there." means someone wants you to unpack once you arrive at your destination - it might be the person speaking (your parent?), the person on-site (the camp counselor?).
"Supposed to" can also be used when you talk about general rules of good behaviour, health & safety, or common sense, for instance: