For us Service-Love Language-People, we can Yes-Yes-Yes until resentment builds up. That's what happened to me during my marriage--always pleasing. One thing that helps me say No and have healthy boundaries in my current relationship is that there is often guilt when saying No and that's OK! I think I actually read that on Medium. Better to feel a little guilt than to build up resentment. Saying No also makes Yes more meaningful. I like the Uno -Skip-Card analogy!