I don't think you did anything wrong other then apologize for not making him happy. You can't make him happy and his problem is not your fault or even about you. I would stop apologizing and blaming yourself its his problem.
The flowers were nice and the phone call ok. Don't talk about the M or the D.
Someone just told me because I messed up on Mother's Day too and talked about R that it doesn't really matter because if they come back they come back and those who aren't going to aren't and that they don't put much stock in what you say anyway.
I was advised to just be patient and quite and wait for them to come to you. So I am passing it along. So move on with your life and just keep eyes and ears open.
