I dont know if i should leave.

Hello, im 29 F. Boyfriend is 30M. Weve been together for almost 3 years. 9 months ago i had a my daughter. Shes my whole world. Boyfriend has had questionable behavior regarding alcohol and drugs... hes done things im not happy about.. last night was my final straw.. he was watching out in the livingroom so i can relax. I went out to give her a kiss and i stepped on a pill. A little pink pill and he tried to lie to me when i asked him what it was. He finally told me it was morphine. Wouldnt tell me where he got it from. It was right where my daughter was playing... i look around the foor and find another pill. Apparently it was half a xanax and it looked wet. So i lost it. I told him i was done, i cannot do this anymore. I went to the ER with my daughter. We were on observation for 6 hours. He was mad at me that i was yelling at him but thats not acceptable. ingesting pills is fatal for children. That is not forgivable to me. He has had other instances revoling alcohol that i cannot accept. We were supposed to be working on trust. Now i nor longer feel like i can trust him to care for my daughter alone.. theres other things that have been bottling as well.. general not helping with the house and expenses.. leaving the cars on empty all the time.. i just cant do it anymore... its causing too much stress.. but now im at the point where should i go for full custody? I dont want to keep them apart, i know they love each other.. but i cant leave her alone with him if hes going to be irresponsable... and how am i going to raise her alone? Right now my heart has sunken.. i feel so alone.. i dont want to start over again... this is not the man i thought he was and this has shattered me apart... i dont know what to do from here.. im 29... i want more children.. i just dont see that happening anymore for me.. it took so long to find someone again and then this happens.. i dont feel like love is in the cards for me.. and now my daughter wont have her dad there for her. I want to give him another chance but honestly, how can i? My daughters safety comes first... i just dont know what to do.. i have no one to talk to.. please help me somehow..