It's less than a month from our wedding date.  I'm at wits end.  I'm seriously considering calling it off.  Whatever decision I make, I know I'll regret it for the rest of my life.
My first marriage started out amazingly.   We danced together whenever we could.  We went hiking, bicycling, canoeing, camping.  Life was wonderful.  Then, only four years into our marriage, we discovered that she had a disease which was taking its toll.  We gave up hiking, bicycling etc.  We even had to give up dancing.  For the next thirty-two years, I spent a lot of time shuttling her to/from her doctor's appointments and taking care of her.  Eventually, I was pushing her around in her wheel chair.  Finally, she died in her sleep in our bed beside me.  I'm still devastated from losing her.
Now, I've met a new love.  We dance together whenever we can.  We go hiking, bicycling and walking together frequently.  It seemed I was getting a second chance to enjoy life.  We've been engaged two years now.
We just got the doctor's report that she has advanced cancer.  Statistically, she has less than a 50% chance of surviving five years. Even if she beats the cancer, there will be life-long limitations.  I can't stand the thought of losing her.  But, worse I can't stand the thought of going through the agony of a dying wife again so soon.
I've made an appointment to see a physiatrist.  I'm going to accompany my fiance to her doctor's appointments.  But, I will probably call off the wedding.
My question for this forum is:  what will the world think of me?  I'm a coward.  I'm weak.  Probably worse.  Don't hold back.  Let me have it!  I'm going to have to learn to live with my decision whatever that is.