In this world there is give & take. Sometimes we take help of others & at other times we give help. It’s fine to take help of others if you are comfortable in doing so & the person is close to you. But once you decide to take help, you become obligated in some form or the other. In this obligation, you may have to morally return the favour. And if you can’t, the minimum your humanity demands is to express gratitude.
Use me but atleast say thank you !