Can someone tell me what's going on????

So about two weeks ago, my SO started having little fights here and there, then last week, he finally just left after one of the fights, said he needed some time to clear his head... but then he decided he was just done with me.... so fast forward to today, I'm having a conversation with his son's mother, and she tells me that her son is sick and she took him to the ER last night, and he didnt even care... he wont talk to his son now.... this is not like him at all, and we don't understand why he's acting like this... he works at a jail as a correctional officer and Im wondering if something bad happened to him at work.. he won't talk to me about it so I dont know 😕😕😕 it breaks my heart because his son loves him sooo much and keeps asking for his dad..