I don't know how to explain this, but I'll do my best. So there's this girl, right? Yeah, I've been head over heels for her for a while. But, there's this other guy who has been actively flirting with her. I've seen them talking a lot recently, and it's been killing me. If she gives anyone else a lot of attention, it seriously dampens my mood. Like, fuck, it's so bad sometimes that I completely shut down. It's not just this particular person though, this has happened with pretty much everyone I've been into, whether I'm dating them or not. Is this normal, or is it something I need to fix?