you would need to be the Buddha to feel nothing. And note jealousy type things, but say someone who you thought was a friend but was sabotaging you or bad for you... a toxic person. Jealousy is inane.
Check out The Untethered Soul by Michael Singer
The key for me is understanding that the emotion itself isn't a choice, and therefore isn't something I need to try to control it feel guilty about. Feeling angry or jealous or sad is unavoidable, but feeling those emotions without acting in ways that fuels them without any other reason often ends up making people feel worse for longer. I don't want to make it seem like I don't struggle with this as much as anyone else, but the times when I've been able to follow my own advice about this pretty much universally have ended up better for me than the times when I let my emotions dictate my actions.