Emotional blackmail?

Ree • 24

My boyfriend loves me very much and I love him but we are both damaged people been through very dark times in life. He had depression for years and it’s only recently been getting better within the past 8/9 months but he always tells me that I’m the love of his life and if he ever loses me he will kill himself. He used to tell me he wanted to die etc when we were friends and I was always there for him and tried to support him etc, but he still threatens with it now.. I understand if he feels that way or feels overwhelmed with certain things but telling me he would kill himself if he ever lost me feels like emotional blackmail? Like guilt tripping me into never leaving? I don’t know but I’ve never shown any intentions that I was going to leave and I currently don’t plan on leaving at all so I don’t know why he keeps telling me this... I’d really appreciate some advice. It makes me feel strange because it’s like if he didn’t have me what does he live for? I don’t mean that in a bad way AT ALL but I’m wondering if it could be an attention thing as before we got together he was sad a lot for sure but he was just getting stoned everyday to numb the pain he told me. Just feels like he doesn’t have any purpose in life if it’s not with me and I’m uncomfortable with that, but I do love and care about him so much I just don’t know what to think