The girl herself is not really a threat and I don’t judge her too harshly for wanting to shoot her shot so long as she doesn’t cross Shun’s boundaries. I don’t think our new couple is really equipped to deal with this though. Shun is perhaps too nice and not one to be confrontational. On the other hand, Hinata is too extreme and reactive, she comes off as possessive and she knows it. That said, the previous incidents where that happened were few and far between, if she had a ”rival” to regularly challenge her, that might give her enough opportunity to examine her feelings and improve how she handles these situations.