That happens as you have expectation from life to be treated well from the same person. Why? If they are on lower level then you, its not possible to treat you the same.
On the other hand, life will bring unexpected beautiful things that you never even think of. So know one thing, you already earned it. So don’t worry about those people who don’t give back the same, life will. And you are learning in the same time to give and not to expect anything in return, as that is true giving. You will always stay with only those kind of people who give that care back. Sit, relax and observe. Who is not worthy to be in your life, you should let them go. But life always pays back good deeds. Namaste @monchhichi23