Husbands bipolar

I have been married to my husband now for nearly 3 years, he suffers bipolar affective disorder which i am finding a little easier to handle now he is on his medication.....or should i say easier now he isnt physically abusing me only verbally and mentally. I know it is an illness and i have supported him throughout it all even when he was bruising my ear or arm or leg or eye. But now he is on his med after 4 attempts of suicide i just cant seem to handle living with him anymore. My daughter who is 9 is suffering at school and is constantly worrying that we are going to fall out. This isnt good for her at all. I just think sometimes why did he marry me knowing he had this illness and knowing i had a daughter form a previous relationship, knowing he would be putting us through what he as. It got that bad, (after he was previously diagnosed before he met me), i tried to commit suicide. I just couldnt take it anymore i was that depressed. Anyway now that he is on his med he doesnt hit me anymore or force me to do things sexually with him, but he is still so mean and says the most horrible things to me. When he is like this the past experiences just come flooding back and i just cant take it anymore. My daughter told me the other week that she would be happier if it was just me and her again.....but yet if did leave him he would try suicide again. I dont want that as i do love him when he is the nice person he is, and he as soo many friends. The other side of him thou only i and his family see. I just dont know what to do anymore. It is a roller coaster marriage, Me and my daughter are walking on eggshells whenever he is down. I know if i stay with him, it will be like this for the rest of my life. Yet like i said he can also be the lovliest person aswell. I just dont know what to do.