Thanks for the replies! I wasn't actually sure if it could be from the bipolar and I was to some extent excusing his behaviour because I thought he might be in some delusional phase. We had amazing intellectual compatibility and chemistry and a pretty respectful friendship before this, so it was hard for me to accept he was being deliberately mean to me, even if it was very obvious. Thank you for the reality check. It's sad that he was trying to hurt someone who cared about him so much.