full time supervisor looking to do part time...

i'm so invested in my store but i seriously have no life outside of work & got a job offer that's willing to match my wage & let me create essentially my own schedule!! i really don't wanna pass on the opportunity and they know im kinda one foot out the door here with how everything's been the last few years but im so attached!!! thinking and debating asking the sm if switching to just closes or seeing if that's an option :( we're already short staffed & they call me in any day off i get lol so do we think manager will flip?