loving a friend or lover as a friend

After my ex left me when I was pregnant his bast mate was so disgusted with him he took care of me throughout my pregnancy and when my daughter was 6 months old we both felt we had started feeling more for each other than just friends.... 10 months later I wanted to kill him!! He drovbe me up the wall and the person whop I loved as a friend changed so much in those few months simply because the feeling structure changed from friends to lovers... once we broke up he changed back again and am pleased to say he is still one of my best mates... but worst partners lol!!