He left us

I don't really post much on here but to be honest I need some support sorry, so my man and I had en together nearly four years he was a brilliant step dad to my 8 year old son and we have also been trying for a year for our own baby. We have been arguing a bit lately and last Friday he went out with friends and didn't return home until the early hours, I was frantic because my messages were delivering and he was ignoring me, I actually thought he was dead in a ditch, he came home we argued and he went out again the following day all day and night, I know it wasn't very mature and I regret it now but I packed up a lot of his clothes and chucked them outside the door childish I know so I don't need to be made to feel any worse, he got his clothes and went to stay at his family's house, on the Sunday and Monday e came round for dinner and we tried to keep things normal for my son, because we agreed we needed a fe days apart but we would work things out, however on the Wednesday he decides he doesn't love us doesn't care about us and doesn't want to be with us. When we were together we both agreed no Facebook as it causes problems he is now not only back on Facebook but telling me he is talking to other girls and will be ready to move on. Sorry for the rant but I just don't know how I'm going to get through this and be strong enough for me and my son, I feel broken inside 😢😢