I'm so frustrated and stressed

I'm about to loose my mind I'm in the process of getting a divorce and I'm also 15 weeks pregnant.  I sent my soon to be x stuff last week, I payed for it I just wanted it out of my home.  Right after I left the post office I took a pic of the receipt which has the tracking numbers and emailed it to him.  A few hours later I get a nasty email saying "send me my fucking stuff so I dot. Have t email you any fucking more". I somehow controlled my anger and frustration and sent him a nice email saying". The last email I sent had the tracking info attached to it,  I've attached it on this email again". He never responded back.  I get an email just an hour ago saying "what's the status of my stuff". I'm so frustrated and just loosing it, just leave me alone already, I sent him his stuff after all his ducking. Cheating and lying and emotional and verbal abuse just go away and left me live my life with my child who he as well denied.  Why is this happening to me.  I'm so sad and crying and just a mess I feel strong sometimes but the. Other times like my world is falling apart.  Why is this .  He's moved to a new state has a bunch of girl and is on dating sites and just has this hatred for me that I don't understand I have him everything, I supported him financially I supported him when his family didn't,  I was there and this is what happens.  I'm just so frustrated and upset