It may also be worthwhile to try to keep in mind that initial attraction (especially merely PHYSICAL) does NOT indicate a lifetime relationship.
There may be spark and even some FIRE in the very beginning...but as people get to know one another they may realize there is in fact no real common ground.
That's why it's called dating. You get to know people and see if there is anything beyond a few shared jokes, a coupla double entendres and maybe mutual hard-ons.
Sometimes it works out.
Sometimes it doesn't.
It's not about cruelty. It's about understanding that you have to meet lots of Men to understand what it is you are really looking for before you meet the right one. It takes time. And experience. And maybe a little patience
One of My best friends EVER was a guy I dated - once - and absolutely hated even though he was beautiful and we had a similar sense of humor. We ran into each other again later, and having accepted that there was NO reason for us to be romantic, we went on to become the very BEST of friends. I LOVED him. Dearly. It was not a bad deal although not what I thought I initially wanted.
Too many boys confuse a broken heart with a broken ego.