Sorry you've found yourself here GMD frown You need to tell everyone your story on the newcomers thread so people can respond personally to your story.
Initially what you need to do is to not text him at all for now. Leave it a week or two to let the dust settle. Do you have friends or family that can rally round for the next two weeks? At the moment your H is angry and nothing you can do or say can change him. At this moment in time your H has left your marriage.
He may return at a later stage and there's nothing wrong with having that little bit of hope that he will return.
After the initial shock and upset is over, you need to start working on yourself. This is for your mental and physical health.
He does sound like he's in a MLC and yes his friends may be egging him on. I thought this at the start when my H first left me, but now I don't think he sees his original friends.
This novelty of living with another couple will wear off eventually, we would hope so anyway. Right now you've got a long road ahead of you.
Get yourself a new thread on the newcomers page and then you'll get a lot more help. Let me know on here once you've got a new thread.
Look after yourself and take care smile

H47 me48
T22 M21
S20 - Got high functioning autism
3/2000 H admits to OW and moves out to live with her
11/2000 H moves back home
2/4/13 H moves out
H tells me he wants D 6/13, but now he can't afford to!