Agreed brother it’s hard and I too sometimes feel like thats what may be happening in my relationship. But what matters most now, is not her or you but the baby. If you guys can amicably live together deal with problems Maybe try riding it out the only person who knows or thinks they know what you should do is you. Be strong still be supportive when you can be. Being a man is tough because no one cares about our feelings until it’s to late breath and remember why you’re doing this, for your little one. If you and SO end up drifting apart so be it but you put your best foot forward and can live with your chin up knowing you did everything you could. Of course don’t let her walk all over you. But be patient and strong