When one man tells another he loves him, I think it takes a great man to do that. Men often skirt they love each other, but never forget that friendship is often love in another form. What you did with your friend is wonderful and I bet he treasures it. There should be lots more of it.
Chemo can be worse than the cancer itself for sure but where there is life there is hope. I hope he gets past this all and manages more time to make newer memories for you both.
My Mum had lung cancer over twenty years ago. She sadly died last week, but not from the cancer. That was conquered and she had the heart of a lioness. Her time had come. I knew she was going to die but was lucky enough to have got the time to be able to say the things I needed to say to her...
Your friend deserves your honesty. You deserve each other's friendship. In life and death it is important to be genuine and sincere. Seems that is what you are doing.
I have seen a lot of death in my life. I have been at too many bedsides when people have died. The ones that passed on the most settled were those who knew they were not alone... You being there for him will be worth so much just now to him and for you in the future
I wish you both well