NTA. I get your friends point, but you can’t go through life anticipating other people being passive aggressive. It’ll drive you crazy and it sounds like you’re trying to get out of that hole and I think that’s really good. Like someone else said, they could just say “I’m not that into this” but these things are hard either way. If there’s anything you could consider doing differently, maybe just asking politely something like, “Hey it seems like making plans has been pretty tough lately… Is there something bigger going on I should know?” And let them talk it out with you. Going through life guessing and worrying is no way to be.