Guys Only : I don't want to lose him.What do I do?

I’ve been with my boyfriend Kevin for 18 months now. I’ve stayed good friends with my ex Milo during that time and although Kevin wasn’t too happy about it he never made an issue out of it. About 3 months ago I was in a freak car accident with my ex which left me with a concussion and a broken arm and him in a 3 month coma. I needed a lift home one night and couldn’t reach Kevin so I called Milo and he picked me up. It was raining like crazy but Milo came anyway. I spend every free minute I had by his bedside while he was in a coma praying like crazy that he’d wake up and talking to him. This caused a lot of problems in my relationship with Kevin but I didn’t care because I thought he was just acting childish. Milo woke up 2 weeks ago and we’ve since discovered that he’s lost the use of both legs and is going to require physio therapy. I want to be there for him through it because it’s going to be a long road but my Kevin told me last night to make a choice between him and Milo because he’s sick of being second to Milo. What do I do?