save relationship

how do you save a relationship when you feel like you don’t wanna be in it anymore? we used to be so different and so happy and so kind and caring to one another so i know there’s something worth saving but since having our son there’s been a major change. i’m not happy and i know he’s not even though we don’t say that to each other. we fight everyday over little stuff, for no reason and it’s honestly draining at this point. i know every couple goes through this... but how do we get out of it?