>>94013067>Marco asks Jackie to the movies, being pushed into it by Star, Janna, and a demon curse that won't go away until he does it>Jackie asks Marco to the dance, he had already asked Star, apparently not considering Jackie despite her having accepted his confession twice and them having gone on one date already
Star was the one who bought the concert tickets, but it still says something that Star had to be the one to orchestrate a date between Marco and his girlfriend to an event they're both interested in. It's not like Marco doesn't have the money to buy a pair of tickets himself. At best you could say Star and Marco consider Love Sentence "their thing" which still makes Marco a good friend to Star and a bad boyfriend to Jackie.
And he was definitely excited to go to the concert before he found out Star invited Jackie too.>it's reasonable to assume he has already talked to other about it, including Jackie.
Marco has issues around Jackie at the best of times, but after Star left he couldn't even talk with his parents without constant moping and connecting everything back to Star. I'm sure Jackie would have came over and tried to comfort him, but I doubt she got anywhere.
Not showing how Marco went from literally crying into his oatmeal to casually showing up on Mewni with a box of cereal was one of the movie's biggest failings and I hope it gets addressed later, but I just doubt he went out of his way to let anyone but his parents know he left.
I've heard in another thread that allegedly some staff member said he didn't even tell his parents, but I don't have any source on that.
At any rate, I'd say ditching Jackie in another dimension to go after Star for any length of time is grounds for Jackie to start to get fed up with his shit. With how bent out of shape Marco was about Star leaving I doubt she would have pressed him about how he was handling her confession either, if he left her without talking through that she might assume the worst.