The final scene in Monster Bash addressed what we all thought, that Star was rushing things too much in this half of season. She had all the best intentions, obviously, but still didn’t stop to think, to plan, for a moment - and Eclipsa’s influence, despite how little they talked together so far, didn’t help for sure. As soon as Star got over her nasty obsession heartache for Marco’s smell she seemingly set onto changing her life for good. Become a better princess, improve Mewni. Maybe she didn’t stop even for a moment because she feared she might have relapsed into her old habits of leaving things unfinished, running away at the first difficulty, and that’s why she was annoyed by Marco’s return at first in Lint Catcher: Not because she didn’t want him back in her life, but because she was scared of what it could have lead to (this obviously turned out not to be the case, since if anything Marco is the most supportive person she has).
Could this “youthful rashness” apply to Tomstar as well, though? In Club Snubbed Star was initially clear on what she’d have liked Tom to be: a friend. But she was quick, even too quick, to change idea in the following episode, as soon as she saw in him a “kindred spirit”, someone who was going through a similar situation of great changes (plus great duties from being a royal heir).
Could the accelerated pace at which Tomstar happened be blamed on the writers wanting to find a quick and easy way to add drama to the mix, or (and I truly hope it’s this second case) it was all part of Star “rushing things to a fault” new style of life? Tom’s behavior and priorities didn’t match Star’s ones in Monster Bash, but this got fixed before the end of the episode, making up for some good growth moments for Star. The opposite didn’t get addressed further, though: Star’s priorities and expectations in their relationship didn’t seem to match Tom’s ones, and I don’t think this can be blamed on how busy with the planning she was. While Tom wanted to kiss, Star reacted in a playful, almost childish way.
Could this be Star’s version of the events addressed in Sophomore Slump? Just like Marco couldn’t put full effort into his relationship with Jackie because part of his heart was always with Star (because let’s be real here, the issues where there way before The Battle For Mewni, even when Star was still living on Earth), Star can’t be fully invested in her relationship with Tom not only because she was too busy with Mewni, but because that’s not what she truly wants, just what she thought she needed.
Is it possible that just like Star tried to change Mewni overnight, just to realize that’s not as easy as it seems, she might have also tried to change her feelings for Marco way too quickly for her own good?