Boundaries are a make or break thing. People who are used to bulldozing them will vanish from your life once you start enforcing them. You're better off without them I think.

It's a never ending downward spiral if you let people overstep them because then they've set a precedent and will conclude that you'll eventually cave. The only person that loses when that happens is you. You feel like shit because your boundaries haven't been respected and you feel doubly shit because you didn't stand up for yourself.