Anyways SolCal has such a delicious and fraught dynamic.
You tell your dad you're just playing outside with your friends and he says 'that Cal is a nice boy.' Your mom berates you for your rebellious nature even if you're down in the dirt in geoponics trying to cultivate the earth everyday. The only universe in which your investment in your family legacy gets you a shred of accolades is one in which you fail to live up to it (Lum remains governor and you politick for the second cultivator position.) In every other world, in every good world, Cal is the child your mom wanted to see you become, and your dad wanted to see you befriend.
And he's so NICE. He's caring to a fault, stands up for Tammy if you're mean to/dismissive of her. Protects Socks with all his heart. Breaks his pact of pacifism to fight Lum in the cure ending only to die for his principles (which is, notably, not something Sol can do/attempt even in a bad ending.) He essentially IS Flulu in that moment.
And then there's Tammy. No matter how things go with Sol, Tammy is always going to be someone Cal loves with all his heart. Even his romance lock-in (in contrast to Tammy's) has him agonising over his feelings for both of you one more time. But his indecision isn't heartless or flippant (like Vace.) It's genuine and built on a fear of 'making the right choice' - a fear Sol is all too familiar with. How will my ending look if I do this? Is there a better way? And Sol is in the difficult position of knowing full well that there IS an entire other way to live. The more likely way, even. Maybe the happier way.
And yet... they can love each other anyway.