Having only seen up to Netflix ep 25:
Totally agree re: immaturity and it's partly why this story can be so frustrating, I have to check myself and remember that it may well be their first relationship ever which means communication is key...and not so prevalent here. (Arguably i'm too old for this story. )
Also - earlier in this forum, someone (can't remember who off the top of my head, apologies!) brilliantly pointed out that dating or being with DMS would be a game changer for SC, her life would change monumentally and already had as a result, plus he's also an intense guy. When not having experienced a relationship before and then having someone imprint their feelings onto you so consistently and emphatically and not always in the best manner, its a good reason to dig your heels in.
All the above being said, I would like to see the characters grow a little more and start talking to each other rather than just jumping at every little infraction. Learning from each instance is a nice change. Such as when DMS posted their relationship status online. If she didn't want that public, explaining that would have been nice rather than yelling at him, DMS reaction was actually quite good to that response. Ridiculous but less...reactionary. Which is nice.
Also I agree that i'd like SC to own her feelings, if she admits she likes him - then she likes him, rather than hiding or being wishy-washy, but again i'm contradicting myself with what I've mentioned above. Being in a relationship for the first time, especially one that for all intents and purposes is a 'soulmates-meant-for-each-other-defcon5-in-every-iteration-they-are-meant-to-be-together-not-even-death-will-separate-us' kind of a relationship, would be jarring and kind of scary. But still...it would be nice to see some of the cute, getting to know each other, enjoying each other's company, relationship building material, before it all goes to hell in a hand basket. It would give some weight to the relationship.