I need advice really bad Am so upset

I just spent the night at the er, I had an ovarian cysts that popped while I was at work started burning up in fever, well anyways to the point, the nurse who was taking care of happens to know my husband am not at all jealous wife, I always get happy to meet his old high school friends, she was very nice to me and when she said hi to him the first thing that he says to me, “ oh she isn’t dating this guy anymore” so he goes on her Facebook and starts snoop I around to see who she is dating. This isn’t the first times it’s happen, he has so many chick friends every time we see one at the store or anywhere he starts to see if she is single or not like he is looking for his next hook up. I try no to let it get to me but tonight was enough for me am tired of this shit and why does he do this? Any advice? He left me at the hospital cuz I told him how fked up it was when he did that ...