"But Jegulus makes no sense!!"
First of all: ok?... it's literally made up people. Made up wizards even!
Secondly (depending on the fics /characterizations you prefer), explain to me how this DOES NOT make sense:
Hero complex dude, with perfect unconditionally loving family who literally adopted his stray best friend, with second best friend being another stray werewolf kid to whom he literally turned into an animagus for.......... are you with me?.......... gets a crush on his best friend's, again, stray brother who still suffers at home!
Explain to me how this doesn't make sense. Seriously, it's actually pretty much the biggest cliche you could go for, psychology wise.
"But Lily..." first of all, stop erasing bisexual people (working on this myself!), secondly IT'S FICTION!!! And also, was he supposed to be celibate forever? People die, life does go on.
Rant over, thank you for listening.