Ouch! You are really down on romantic relationships/marriage, aren't you? (I assume some people are 'set for singleness', but that's not the position you're expressing.) You speak of looking at others' relationships/marriages/divorces as your reason for seeing them as 'nightmares', but naturally, I assume your current impressions come from your own experiences with romantic/mate love. Am I right? What was the last one like? My last dating relationship was very painful and crushing to my self-esteem (the human experience, not my worth as a son of God). I made some mistakes, had misperceptions, but ultimately it always comes down to you have to get involved to see if your a match, comes with the territory.
Your last relationship that you shared, further gives evidence to what I hold to be true.
Best of luck of finding your soul mate, whether that be a cougar, or someone closer to your age.
Watch out for them cougars, they are sneaky. lol