person A: my best friend friend helped me through some rough spots with my marriage and job. I am gland he was there for me
person B: Thats really nice you have a friend like that.That's hard to come by. I hope everything is better for you now.
person A: thank you_comma_ i do not know how i will repay him back_comma_ I will always be in his debt
person B: I'm sure he doesn't expect it but thats a really nice thing he did.