Just to be clear I know that everyone is busy and are not obliged to immediately reply to my messages. I totally get not feeling like replying at the moment and even forgetting. It happens to me. But even if I forget, I end up remembering the unanswered message and reply something saying sorry, got busy, .... I also think that if one forgets the message, if they somehow think of you one day, they would open the messaging app and would see that they never answered something.
If I have nothing else to contribute to the conversation or someone sends some info that doesn't require a full answer, I at least acknoledge with some thumbs up or a heart or whatever.
By the way, I am very busy myself by the way, with kids, work, renovations, etc. I just think it's the polite thing to do.
So when friends just see my message and then never reply, it bugs me, especially when it happens several times. I obviously don't throw a tantrum or say anything, but it turns me off and makes me less motivated to start a conversation again. The worse is that it happens even with my close friend who's strong on manners.
I even changed hairdressers after I sent one hairdresser some info we discussed during the haircut and told her how my husband loved my hair. She ignored my message (she's very active on facebook and I could see that the message was seen), I found another hairdresser.
AIBU? How others react to their messages being ignored?