Sensitive subject

My best friend is also my ex, we were together for 6 years and things just didn't work out but I'm glad we have been able to sustain the friendship we've always had. With that being said he had me pick him up from a procedure he had done, in the process of this I was pulled aside from the doctor who explained to me that they found the big c but didn't know how big that c was. Him and I spoke briefly about when he was no longer on anesthesia and he said he would be honest with me about what was going on during the whole process, due to knowing I've lost 6 people back to back and I Dont want anymore surprises. To my knowledge he said everything was fine and there's no cancer. I am currently taking care of his house while he's on a business trip and he forgot to bring his chemo meds which he never told me about.....i don't know what to do, how to feel nor how to react. I just want him to know that he has someone that cares for him and wants to help....any advice?