If you do end up dating someone, you do realise they'll grow old, just like you, right?
They might get bored of you; you might get bored of them. You may find the perfect girl and she has mutual interest in you, but what if you find out something bad about her and that facade of her being perfect is broken? What if you suddenly both change too drastically from each other and grow apart?
Seems like that fulfilment was temporary and now you're left with an even bigger void than before, since you believe that no one like her will show interest in you again.
Relationships (of any kind) are the defining point of human experience (arguably) but they also suck ass. Most of them are shit and don't work out. I doubt your parents are happy together - if they are.
Very rarely you find actually happy couples. At a certain age, people can't be bothered to leave/divorce and will stay together just because of convenience.
Women cheat (at a younger age) because they're afraid that they haven't found the perfect partner yet and that there might be someone better out there; they don't want to waste their chances. And men cheat (at an older age) because they realise they've wasted their youth being with one woman and they haven't lived out their life as they want to.
Overall, it's all a fucked up shit show. Opting out may be better for some people but others do want that temporary high love gives you - if they're willing to deal with the low.