I know its bad but what are the chances of this getting fixed ?

Both 50, marriage in a rut. She doesn't like me and I have started to not like her. Minimal communication. When she talks it is always laced with contempt and my reaction to is has always been to clam up because my instinct is to say something back nasty and I don't want to say nasty things, so I marinade in those negative feelings. Infrequent sex and when it happens it is purely duty sex with no effort from her side. I crave sensuality, love and sexual pleasure. I think about sex all the time. When I look back on our marriage I do not remember a single kind word, or kind gesture in the past 10 years. As I get older I do not like the way I look and I feel that since things weren't great in youth they cannot possibly get better now. No acute stressors such as health, finances or responsibilities. Her biggest legitimate gripe against would be that she has to nag for me to get things done, which I ultimately do, but I do drag my feet on the less important stuff. Youngest is 7. I don't want to blow up a home because the kids still do need an intact home, at least for another 7-8 years. If I do what are the chances of ever finding love. Also, it is selfish because I am certain that she is unhappy too, but makes no effort to fix anything. I do help with chores, help with the kids (not as much), do not fly into temper and do not use harsh words. I am East-Indian (considered not very desirable as a stereotype) and in a smallish city in Canada. Been living here 20 + years. I am also socially conservative, don't drink, don't smoke, don't do weed and prefer quiet activities to loud garish party like social lives. Some days I feel as if I could fast forward to the last day of my life I would, but mostly I would rather experience happiness than resign myself to misery.