I guess if you’ve never
had a partner, you’ll have trouble getting it. One thing to take into account, is that there’s an aftermath to the “encounter”. If you get angry about your partner getting hit on, that anger isn’t going to just magically disappear once that person goes away; and during that cooldown time
your partner is the one who has to deal with that anger. (#) So while your partner
may feel flattered that you get jealous about them (not guaranteed), that’s quickly gonna get outweighed by having to cool down your anger on a regular basis. Especially since getting jealous also means you aren’t confident in your relationship and somehow don’t trust your partner. Like, do you really think they’re gonna get wooed away by some random ass stranger?! So in the end, your partner has to manage your anger because you can’t trust them: that’s
really not a good standing ground for a lasting relationship.
(#) Worst case scenario, the person doesn’t back down, you get into a fight, and your partner has to deal with you getting hurt. Whatever chivalry bullshit fiction depicts,
nobody likes seeing their partner get hurt, and if you deliberately get into a fight over something avoidable, you are definitely getting an earful…
Also, in the case of someone who gets hit on a lot, it’s a hassle for them too: they’re in a relationship, they don’t wanna get hit on by random strangers all the time. So it’s already a bad experience, and by getting angry, you make it worse. It’s actually a sign of empathy to be understanding about what they’re going through and to be mature about it. Which makes you a better partner, by being supportive instead of possessive.