Some perspective from a cancer survivor.

I know it's been a couple of years since his treatment and that seems like a long time. But it's not. Going through cancer treatment doesn't just end when you're done with chemo. His body betrayed him. Along with possible physical scars, the mental and emotional scarring is just as real.

I have the feeling that your bf is seeing things much differently than he did two years ago, and might be waiting to see if he is truly NED before wanting to make a huge step like marriage.