After Elevens disappearance Mike had been dating someone else what will happen when Eleven comes back?

While Mike is walking with his girlfriend Sarah he hears Elevens voice say "Mike" in a whispering tone.He freaks out and tells Sarah if she can hear that but nope she can't she says "Mike why are you acting like this.This has never happened and who is saying your name?" -"Nobody is saying my name just never mind.I think I should go home now"- "Yeah go get some rest." When Mike is walking home he hears her again "Mike" he screams her name "ELEVEN ARE YOU HERE PLEASE ANSWER!" - "Mike?" He sees her.Knees to her chest,shivering from the coldness. He goes to make sure it's not just his imagination.IT ISNT! He goes up and hugs her she hugs back.- "Eleven I've missed you so much!"- "M-me t-too Mike." He gives her his sweater and brings her home where she still has he tent house.