What does it mean when a guy says he trusts you with his life?

I have a crush on my best friend (we have hu before but not in a long time). One night we were out and he was talking to a girl. He was talking about me to her and saying how he trusts me with his life and that he would do anything for me.

Trust is extremely important so was he just being nice or is there something more there for him too?

What does it mean when a guy says he trusts you with his life?
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