Sorry, pixie, I sounded a bit hectoring!
Your posts just reminded me of my mother, who is lovely but unassertive, puts herself out endlessly for people BUT because she has zero self-esteem, never challenges anything, or lets it be known that she might have needs or problems or priorities of her own, people metaphorically don’t see her, and assume she’ll go along with any kind of second rate treatment/last-minute cancellations but can be called upon to help out with grunt work.
She’d have behaved exactly as you did, and been half-conscious of resenting it, but never spoken up, and been bitter about it afterwards.
She’s produced three very non-pushover daughters, who are all reacting against the way she is, but to be honest, it was a toxic way to grow up, as she was and is very down on female self-confidence. Because she can’t say what she wants —she’s afraid of rejection and making people dislike her, and her ‘logic’ is that if she says yes to everything, takes every hour-long venting phone call while her dinner goes cold on the table, then no one has the ‘right’ to dislike her — she resents anyone who does say ‘No, that doesn’t work for me.’
It’s made her very lonely, and while of course part of the problem is inconsiderate people — whose crap ness shouldn’t be sidelined — they can only behave that way because she lets them.
I’m saying that at such length to just say, Don’t fall into this trap. I bet your confidence took a knock after the end of your relationship, but you’re worth way more than acting as a kind of unpaid lady in waiting. Look into assertiveness courses, or books (maybe someone on here can recommend one), and value yourself.