Main question in the title.The thing is I was in a long(8year) relationship, and I never,ever showed jealousy.I admit there weren't many times to show it,but it never showed at all. My main mental process was something like "you may flirt and look at her,but my dick is the one that's in her", so why even bother feeling disrespected or upset about it, whether it was her or some other guy starting whatever usually induces jealous feelings. Is this normal? This subject is not talked about enough I think

Also, i'm wondering WHEN it is an appropiate time to show a healthy dose of jealousy.