4weeks pregnant and he leaves

Soo I’m four weeks pregnant and my OH has decided he wants to give things a go with his ex who he has a 4 month old baby too ( I didn’t no anything about her or the baby)

We had a long distance relationship but seen each other every 3 weeks or when he needed me I flew over to him..

He decided to message me tonight to tell me that he wants excitement in his life so we are working because he’s bored..

Then he messaged to say he still wants me to text him regular updates on how the baby is but not how I am.

He only told me tonight that he has been living with his so called ex while we were together but says they weren’t together and slept in separate beds..

Now I’m alone and four weeks pregnant what am I supposed to doo, this is my rainbow baby..

I just needed to rant and some advice..