I get the heart horse thing. I have one. Can there ever be another one? Yes, IF you allow it. I had my first heart horse as a teenager and then after that I had horses that I loved but until I got Patti, not what I call a heart horse. I have others that are better bred, better quality and maybe even better looking, but she's it for me. We just GET each other like no other horse can.
I think you can have another heart horse in a lifetime and even maybe more that 2, but it's not something that happens immediately, it develops over time. Though with Patti, I gotta say it was as close to instantaneous as it can be, I fell in love with a picture on the internet. And I've never regretted my decision to buy her sight unseen, except for a couple of mediocre pics.
Each horse has a place in my heart, but when someone says, "Who's your 'go to' or best or special horse?", I always answer Patti. No hesitation, no though needed.
These are the pics that made me fall in love.
Peppermint Patti as an adult
And with HER foal, Hillbilly Harley, by RA Hot Every Night