I don't know if you are on any meds for anxiety but this was me years ago when my anxiety was really high. Reading so much into what people said and did and especially online stuff where there is no intonation and we have no idea of how someone meant to say something. She probably sent the text quickly then forgot about it. Maybe if things like that are having such a massive effect on which can't be good for your MH then maybe don't text people but just wait till they text you or see you irl.