Ugh, not snake, please don't. I want they just keep as acquittances at best.
Also... FMC it's not even thinking in romantic relationships at the moment but this don't mean she would reject him
It's not because she made other friends. I think there are two things here:
1) He was planning to invite her to the festival, but he was too slow
2) Maybe he fears that once she start to get other friends, he will not be "needed" anymore (but this is just insecurity and he probably knows it)