Cheating...

Has anyone experienced their significant other cheating on them while pregnant? How did you handle it and do you have any advice? Backstory I’m 15 weeks we both really wanted this baby and the pregnancy was planned. Also the cheating was flirting and talking about having sex and meeting up with one girl. He says it began around the beginning of my pregnancy when I was super sick all the time, all we did was arguing and never had sex. He’s been super apologetic but I’m still hurt.