I think it is great that he noticed the flowers and thought about it enough to even write a note. Who really knows what is going through his head. I wouldn't worry too much about him throwing it in your face - and your truth is an innocent one so nothing to worry about. Try not to feel like you need to defend yourself.
My roommate is . . . still an alien. He has done some surprisingly "normal" and "good" things lately but also seems to now be in a truly deep funk and still got lots of crazy in there. I am just trying to let him be, be grateful for the positives but not try to read anything into them, and just concentrate on the kids and me.
It is obvious this is going to be a long journey, but you can't get through it without going through it, if that makes any sense.
