Ahhh, so sorry PufNStuf. When you aren't 100% stable, the others around you tend to have a HUGE influence on your moods. When you aren't in a place to look after yourself and then have to look after someone else, the wheels fall of.
I have been there once too often too. I hope that you can soon sit him down and have a real indepth chat to him - how he impacts you and how these things make you feel.
Take some time out and look after you. GO for a walk, meet a friend for coffee, have your hair done... anything to make you feel better