Pregnant with drug addicted boyfriend

Please help I need some serious advice. I’m 39 weeks pregnant and my boyfriend of 3 1/2 years hasn’t been acting right lately, I thought it was the stress of the new baby coming but it’s not. Very nasty & aggressive avoiding me for hours upon hours. Hes had addiction issues in the past but has been sober for 2 1/2 years. Today I realized he’s gone through his 30 day supply of adderall in 9 days. I’m scared to leave but I’m even more scared to stay. I’m very lost. Has anyone been in a similar situation? Any advice will help right now. (Sorry if this is posted in the wrong group, I couldn’t figure out where it should go)