Anyone else feel hurt seeing someone with healthy sibling relationships

Recently I got a boyfriend and when we call I can hear his brother in the background (they live together) and whenever they banter or just have a normal interaction it kinda stings. Even though I'm very happy for him I'm also kinda like "oh that's how it's supposed to be isn't it. You aren't supposed to be worried you'll randomly see your meth head brother when you're driving around" Does anyone else experience that? Like just having a realization that siblings are supposed to be a positive thing? Even though my relationship with my sister is stable now it doesn't change the lifetime of weird trauma related to my siblings