Caught boyfriend cheating

So, after noticing my boyfriend behaving secretively with his phone and offish with me I got his phone out of his pocket whilst he was asleep.

To my surprise he had been messaging a girl from work! At the same time messaging me asking me to download court forms for him to adopt my children.

I kicked him out, took back the car I paid for and his phone which is my contract and I paid for. Surprisingly the girl he was speaking never responded to my message.

My kids are devastated. He even went low enough to take the boys playstation!

I miscarried our baby 7 weeks ago, how am I gonna get through this!!