I might be being a little naive here, but in which way is it one-sided?
Is it you wanting more contact, not getting it and feeling disappointed or are you feeling used because a friend is too demanding?
Over the years, I suppose I’ve had both and took the decision to step away from the former and if I bump into her, it’s just a chat. For the latter, I decided not be so readily available and she eventually took the hint and I heard she was pestering her neighbours with her demands.
As others have said, in later life our friendships mean a lot, but some do come with a shelf-life.