Need advice/insight regarding bipolar boyfriend

This is my first time posting on a forum of any sort and I'm not one to generally look to the internet for advice but I'm at the end of my rope here. I have been with my boyfriend for four and a half years. We have a 3 year old daughter but do not live together currently. Our relationship is full of ups and downs; when things are good they are great. when things are bad they are hell on earth. When i first started dating him, things were good and he was on medication. He was fun, caring, kind and intelligent. I really saw us going somewhere because we had great chemistry. Then he stopped taking his medication ( I think he lost his coverage) and everything went to $#%^. On top of that, I found out I was pregnant and he would go back and forth on whether or not I should keep the baby. Finally, I just decided to keep the baby. Ever since he went off his medication, he will break up with me and then get back together with me, he will ignore me for days on end (he claims to be overwhelmed) and he will cancel plans with my daughter and I quite often. He will be fine hours before, telling me he loves me and cannot wait to see me, and then I will get a text out of nowhere saying he either a.) cannot come or b.) wants to break up with, claims "he is done and this is it." However, he might not have an episode such as this for a couple months and I get to thinking its not going to happen again (dumb I know). Yesterday it occurred again surprise, surprise but this time it seems he was serious about never seeing me again. It just seemed different and I'm hurting from this; I have anxiety myself and I can't even think straight from all the pain this has caused me. I do know what to do regarding our daughter. She's young but I'm afraid he will constantly disappoint her when she is old enough to realize. I do love him but I'm emotionally exhausted from dealing with this and i'm always wondering when one of his episodes will pop up again. He knows he needs medicine, he works in behavioral health himself even but he will not make any attempts to get back into therapy or see the psych. I was just wondering if anyone had any similar experiences in dealing with a bi polar partner. When he did this, I would always blame myself. I thought I was being too clingy or needful and I backed off. He is now telling me he wants to find someone new and I don't know what to think of that.