Me and my partner of 3 year had a baby girl together 11 weeks ago. Yesterday I got him to admit to cheating on me right at the start of the relationship with a girl from a night out. I thought they'd had sex because they slept in the same room with another girl but I decided to trust him. I've brought it up in conversation numerous times over the past few years and he's always looked me in the eyes and said he didn't do anything. But now he's said he did. I'm heartbroken! Would you stay with your partner if they did this?