Think he might've cheated with prostitute

8 months pregnant. Think he might've cheated with a prostitute. Found a message on his phone. Said something about an outcall and him sending money first. Can't even explain how I feel besides being disgusted. Introduced myself to his ex he has two kids with and talked to her and asked her why they ended and she said he cheated multiple times and even with a prostitute which I didn't mention to her about the message I found. I tried breaking up with him and he started acting crazy.