I know that feeling, I looked at 5 horses before I bought Mitch... (I do have a point to my story
1st horse, Kanuka, I really liked her and rode her etc, I was wanting to buy her, I was the first person out to see her, then I got a call the next day saying they had sold her sight unseen to a person 5 hours away..... Thanks guys, I had already said I had the money and transport to get her..
2nd horse, Danasinga, I got on him and he exploded from a walk and left me on the way to the hospital with severe back pain... Turns out the owner had managed to leave one slight detail out when I asked about past injuries.... He had a snapped neck muscle... again, thanks guys.
3rd horse, Badger. Now this one wasn't the owners fault, she genuinely didn't know and I believe her. I had a girl get on before me (owner was pregnant and I had been thrown off danasinga weeks before and wasn't ready to be thrown off someone elses horse again) and he was reacting really badly to weight, so she jumped off... Turns out the poor guy was suffering from laminitis, but you couldn't see it until he was trotting on dirt (he was lunged after the girl got off).
4th horse, Leena. She was a nice horse, but I didn't like her because she was far to stubborn on the ground, and refused to move faster than a walk for more than 5 paces. Owner was shocked that she was being so stubborn.
5th horse, "Man" I think his name was. Again, I had someone else get on before me, but she was also looking at the horse for her mum... We think the saddle was incorrectly fitted because the owner was fine on him cantering etc, but owner was very petite. Girl that rode him before me asked for a canter and he exploded, and sent her head/neck first at the ground. After that I decided there was no way in hell I was setting foot in him, and mum had said right, that's it, no more horses we are not looking at ANY more.
A few weeks later I got an email about this supposedly trustworthy horse, and that with my run of luck it sounded like I could do with a decent horse, so there began the story of Mitch. We went to see him, and picked him up a few days later.
I don't know if you'll see this the same way I do but...
Point of my long story is that, for one reason or another, I wasn't meant to be teamed with any of those 5 horses, I was meant to be teamed with Mitch, he come to me I never went looking for him. We've had a bit of a rough road with injury etc, but I do believe he is the horse I am supposed to have, and I believe that for whatever reason, that 3yo horse mustn't have been the one for you, you'll find one, probably when you least expect it.
So good luck, keep searching for a horse!
you'll find one eventually.