I'm really glad you said this out loud. It shows how deeply you care and how conflicted you're feeling.

I want to be very clear and gentle with you.
People who lose someone they love to suicide don't just "get over it." Many do keep living, and some do heal in certain ways, but the loss usually stays with them for life. It often changes who they are, how they love, how safe the world feels. Partners especially tend to carry a lot of unanswered questions and guilt, even when it wasn't their fault. The pain doesn't disappear; it just gets carried.
And the fact that you're worrying about him right now tells me something important: your life matters to him, and it matters in ways that can't be replaced. If staying alive feels hard, staying alive for now because of love is still a real and valid reason.
I also want to say this:
The part of you that thinks about hurting yourself isn't you wanting to die, it's you wanting the pain to stop. Those are not the same thing.
You don't have to decide anything about the future today. You only have to get through this moment safely.
If calling feels like too much, could you message your boyfriend, a close friend, or a family member and just say:
"I'm not okay and I need you right now."
You don't have to explain everything.
Let me ask you one important question, and you can answer honestly:
Are you safe right now, or are you feeling at risk of hurting yourself in this moment?
I'm here with you. You're not weak for feeling this way, and you're not a burden for needing help.