Well, if you love someone and you give and give selflessly, and you never get anything back, will you continue to give forever, because you love the person?
If the answer to that question is no, then you are in the relationship for what you can get. You are, in @marinelife‘s words, a gold digger.
I’m sorry. There’s nothing wrong with exchange. I don’t believe for a second that anyone would stay in a relationship forever if they never got anything from their beloved. Love is a mutual thing, not one-sided. If it becomes one-sided, then most people will leave it, unless there is a really good reason for it to be that way. But even if someone is sick, they might have a kind word from time to time. Some don’t, of course, and yet their beloved still cares for them in memory of all the good times—where they were getting something from the other person.
I refuse to believe that people will continue to give people something without expecting anything back if they get nothing back, ever. I don’t know anyone like that, and I’ve never heard of anything like that, so my opinion is that everyone is involved in relationships because they get something back.
I have no problem with this. It is how we express our love for each other. We give and they give and we give and they give and it is mutually reinforcing. If it stops, and one person does all the giving and the other does all the taking, then what is in it for the giver? In most cases where I have seen that happening, the giver gets very unhappy. The taker doesn’t care; he is getting what he wants anyway.
Relationships are about exchange. They are about conversations and activities done together and building lives together and all of that involves exchange. If someone stops holding up their end of the deal, the relationship dies.
Not only can you have a relationship with someone if you care about something in return, you must care about having something in return, or there is no exchange. There is no relationship.