The relationship was toxic. He was manipulative and gaslit me throughout because he was entertaining other girls and never spent time with me/never made plan and would cancel the ones i made with him last second and it really hurt me and affected me mentally. He called me petty and an overthinker. He never said sorry for the things he did that hurt me and barely offered support when he knew I was struggling mentally, but I was always there for him and he knew that. My mental health plummeted because of the relationship. After he broke up with me it got worse. I was severely suicidal and I'd been self harming for a long time and he didn't know. When he found out he said "just don't do it" and that was that no hug nothing. The night after he broke up with me I wanted to drink myself to death and was going to take a bottle of tylenol. I was really drunk. I messaged him telling him I wanted to kill myself, I didn't mean it as a threat to get back with me or anything I just wanted support and i was struggling and hes the only one that knew about my mental health. I was scared but I was hurting so bad I wanted it to end. he took it as me trying to manipulate him. He said I cried crocodile tears and I needed to 'practise [my] manipulative ways for future relationships FYI' which really hurt me.
He blocked me and I contacted a friend who helped me that night. I threw up before I could take the tylenol and my friend convinced me not to do it.
It's been 2 weeks since then and I have gotten support from family and friends. 
I want to apologise for what I said that night though, even though I didn't mean it as a threat and just wanted his help. I feel awful about it.
There's so much more that he did to me in the relationship that'd take forever to get into, but I've told others details of the events and they say he manipulated me.