Marriage over 😓

I'm just feeling lonely and need to talk to some ladies because I'm to embarrassed to tell my friends and family yet but I'm 19 weeks pregnant with our 3rd and my husband has just left me we have been going through a rough patch lately but we have been together for 12 years and we always have ups and downs so I thought we might just need some space but I just had this gut feeling - he said he's working away this weekend so I looked at his emails and found out he's staying at a beautiful hotel at the beach with a girl he's been talking to for a couple of weeks I'm completely heart broken and I don't even know where to start or what to do 😭