I don't mind friends prioritising time with their partners, what I mind is when they make zero effort and then have the galls to complain that they don't get invited to outings anymore

A (no longer) very close friend is like this, ever since she's started dating her now-husband, we (not just me but the rest of our group and her) haven't spent time together without her partner for more than maybe 3 times total.
In 6 years. And two of those times was because he was out of town for god's sake. If that's where your heart lies, by all means enjoy your relationship and hope you're happy and valued, but you can't expect people to be on standby in case you change your mind or find yourself alone for a few days.
After having him tagging along to literally all the plans for years and never having a heart to heart with said friend about anything, I'm just done. If and when she wants to meet, she can arrange something herself and I'll attend if I fancy it but I'll no longer make the effort, especially after an entire pandemic without so much as a 'what's up' text. Now that I'm out of the common group chats (I can't keep up with constant conversation) I have no idea what's going on in her life apart from having a child and work and husband, and I'm just tired of feeling guilty.
I said something similar on the child-free thread, but I don't know why it's always the responsibility of the single/child-free part to make the effort for the married/parent friend and never the other way around. Sick of feeling like my time and life is disposable to some because I'm not married/in a relationship/a parent. Piss off.