Pregnant and stressed out

Long story short I thought I was on top Of the world. Here I am six months pregnant with the love of my life.... or so I thought. He’s been living with me for the past seven months. I post a picture of us on Facebook and got a message from someone I didn’t know. Come to find out he’s married.! They’ve been separated for sometime but I knew nothing of this. I mean how can I? Especially if he’s been staying with me for so long.? Anyway the message goes like “You whore, you are pregnant by a married man you home wrecker!” And now she has others messaging me as well. I brought this to his attention and all he can do was cry. He said she left him for someone else and that was that. Idk what to do