My time is also valuable. Please just keep that in mind. I feel pretty low when stood up or dissed. I'm tired of feeling like I'm being unreasonable, dull, whiny, or needy about it. And it's not about your work, because it's just not. I'm pretty mellow actually, but when EVERY TIME people forget, are late, act like suddenly work got more important than me or promises to me, (when I know they were slacking or doing something else earlier or the day before), then I feel dissed, unimportant, and suddenly bad about myself and negative about everything. About my interestingness, about whether I'm worthy of attention, about my own work, about my status as a human being without a paying, scheduled job though NOT without a job and actually several jobs.
I hereby declare that I am a different person, one who cares if you are late, or if you forget. I am no longer mellow. If you are late, or stand me up, I will directly yell at you right then and there, and you will apologize. I don't get how this will help, since it will make y'all feel bad and make me look like a jerk, but there it is. Maybe it helps in that I will quit the instant internalizing and negativity-towards-myself of being pissed off. I have just become a yelly person instead of an "oh, it's okay, I understand" person. This goes for friends as well as both my partners.
This, also contributed to by the actions of several people, family, friends, etc. Who lately say things like, "Oh, I"m sorry I'm falling through on X thing, and I'd rather do X with you, but the other person will be so angry. They'll yell at me. They'll think that I hate them. So, since I know YOU will understand, I'm going to go be with person Y, the angry yeller." Okay, maybe I need new friends and family, but, that whole thing has just fucked with my head one too many times. I am no longer your nice, understanding, walk all over me because I don't mind, friend. I am your Bitchy friend who is going to rip you a new asshole if you flake out on me.