I'm looking for a word that that describes how someone might be giving and the other person is just taking and not giving nothing back
closed as unclear what you're asking by Hellion, Tushar Raj, Drew, user067531, Nigel J Mar 4 '18 at 1:12
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I think your word is: unrequited.
It means doing something without condition. Not completely ensuring your request but I think if you use this word, you won't encounter any problems.
@FumbleFingers is spot-on with one-sided if you want to describe the whole situation, the relationship, or its dynamic.
Both of these suggest a lack of expectation. If you were implying a degree of abuse in the situation¹, they would shift their meaning slightly (suggesting naïveté), but would not be inappropriate.
¹ A common relationship situation is parenthood, where it’s expected to be fairly one-sided, and unconditional (love) is the norm.
The word you're looking for is "reciprocity". Verb form: "reciprocate".
verb (used with object), reciprocated, reciprocating.
- to give, feel, etc., in return.
This word is specifically the act of giving in return, which you mention. In your example, reciprocity would me missing.