tbh i love that clip of magnus's petty ass, and i love that he's kinda wary and vulnerable when it comes to relationships. there's such a huuuge difference in age, experience, and power between him and alec that it would be easy for their relationship to feel very boring and unequal with him as the perfectly mature wise sage teaching alec all about love. it's so much more interesting and healthy if they both have flaws and insecurities and moments of immaturity and pettiness.
Same, and i think every relationship is new, too. Magnus might have had relationships in the past, but it doesn’t mean falling in love isn’t new every time. Alec is his own person, this is a brand new relationship for both of them, and they’re each going to be learning about each other – all their favorite foods, what makes them tick, the things that make their knees weak. These are things they both have to put work into learning, not just one or the other.
So yeah, I agree, it’s nice to see them both a little unsure about their footing and watch them slowly work it out together. Magnus, I think, has enough experience to know how to open communications where Alec might be hesitant to, but I don’t doubt Alec will put in quite a bit of effort, as well. We’re already seeing it happening when he approaches Magnus on his own to apologize and to talk. And if you don’t realize the significance of this, remember that just days ago Isabelle literally had to blindfold Alec and drag him into a room before he would talk to Jace and even then he stubbornly refused to until Jace spoke up first. So Alec coming to Magnus first all on his own is a pretty huge step for him and I think it says a lot about how important his relationship with Magnus already is to him.