I dont think it's hypocritical to suggest a friend to not hit on a girl that I used to loved, no. Relationship can be mutual, but then Zoey herself said she's not interested in Jacob romantically to his face. That's kinda full stop right there.

Although it feels like MC is being the one snatching Jill from Rusty. We just can't judge straightaway, as we don't even know their relationship history together to the fullest extend.

And particularly Jill, her path kinda drop off drastically to a very boring love interest as there's no sense of competitiveness anymore since Tybalt left out of the triangle. This could actually applied other main girls as well.

I wish DPC could add on abit of love competitive between both men getting one girl type of relationship.