tinker belle and Peter are like siblings and Wendy and Peter are like a couple. tinker belle got jealous because she didn't wanna lose her "brother". or she just didn't realize this. like (idk if you watch Disney but it's a good example) Riley off girl meets world. she liked Lucas even tho she really felt like they were siblings, she just didn't realize. there ya go. your welcome. I restored your childhood. 😂❤️