There is a clear distinction between a Pushover and a Tzadeikes.
Tzadeikes= doing chessed for s/o in need. Period. If the recipient is not a mentch and does not appreciate it, then they are lacking good character. It is not your job to fix their character, but it could be an opportunity to work on yours.
Pushover=doing a favor for s/o who is either capable of doing it themselves or does not really need the favor i.e. it’s a luxury. Not only are you not doing them a favor, but you are helping them perpetuate their selfishness. And you are allowing yourself to be trampled upon. You need to ask yourself why you would even consider doing such a “favor”. Is your “friend” very pushy/demanding? Are you not assertive enough? You can be assertive w/o coming across aggressive if you use tact(right now is not a good time, maybe some other time)A torahdikki Yid is a ben/bas melech. Not a pushover!