Dear Sofioula:

Welcome back! Regardless of his motivation sending this message, he wasn’t polite to you when he refused to drive you home when you were sick, having you take busses home and walk a lot, he wasn’t polite when he yelled at you, he wasn’t polite when he turned the alarm on Sunday morning just so that you leave his place early, etc. And he never apologized for these things, did he?

So it is not impolite if you don’t answer his message, it is sensible that you don’t.

anita