I struggle with this as well. My therapist keeps telling me it's up to them to decide what they can handle. It's jsust so hard for me to accept that someone would sacrifice part of their own well-being for me. I'm not worth it. I know I'm not. However, again, I can't decide that for someone else, they are entitled to their own opinion on the matter. If they think I'm worth the effort, it would be wrong of me to deny that to them.
Something like that... I understand the concept of it, but honestly, I don't live by it. I keep pushing people away to protect them from me. To me that feels right. I'd argue that that's my choice as well.
I'm glad you feel a little better about it now. From an outside perspective, it definitely sounds like he is worth your trust and is important to you. I think you should trust him when he says he wants to be there for you.
Hugs and hugs