Same. I'd have played through the Cullen romance if it had been an option but not sure I would've enjoyed it? Definitely the Solas one was more meaningful for me, and I have no doubt Solas would've become the new Fenris for me, and I'd have played the game 10+ times and romanced him every time (as I did with DA2). But it was ever always only 50% about the character and 50% about the people here. And that number has tilted heavily in favor of the people here after DAI came out; even without the romance, I've found Cullen a less compelling character, more vanilla, too easily putting his past issues behind him... I've honestly lost interest in the character at this point. About all he has going for him are his (admittedly) amazing looks.
Hmm, it's interesting to me because I'm the same way, I keep romancing the same character multiple times. I had planned on Cullen actually because I wanted to play as a human, but at the last minute chose elf for my first run, and then Solas became my canon.
I think I nearly broke down when I encountered him with the dog in Tresspasser though.

As for letting go of his past too easily, I think maybe it's just that the player knows more about his past than the Inquisitor, who is meeting him for the first time? I think it would be different if the Warden or Hawke became Inquistitor, and they might have argued or clashed about the past, before making amends.
Anyway my Amell is forever alone, and still out there, somewhere... Here's hoping he gets to tell her what he told my Inquistitor in person someday (if only in headcanon land).