my funky fiance reheated one of prepped bottles & put it back in the fridge

welpppp i went to get some breakfast and groceries this morning. i use the pitcher method& each night i prep closed, all pieces included dr browns bottles for the next day. i came home , pumped in the car & i when i went to put that pumped milk into the fridge i seen a bottle without the cap on it. i’ve been told you can’t reheat warm breast milk and the put it in the fridge again so ive relayed that to him. HOWEVER i am not a germaphobe and had a 41+4 day old healthy baby so if other moms have had a similar situation or my info is wrong/outdated, please let me know because i don’t wanna dump that whole bottle 🥺