It's really aggravating when you put more effort into a relationship when the other person doesn't

They probably do but certainly not as much as you do or in a exact same way as u

Yes, that is super annoying.

It's better to walk away in that case.

If they care you will know it, if you care you will show it. It goes both ways.

Yeah that goes with alot of things besides relationships

One of many signs of a failing relationship.

red flag is waving

It's hard.. all things are relevant and what comes naturally and seems like it is obvious to others can seem unnecessary and hard to do. They probably are doing their best but just aren't right for you on a deeply spiritual level.