My boyfriend of 3 years (about to be 4) admitted to cheating on me 3 days ago. I had JUST lost my virginity to him, when he had sex with another girl. And he told me who else he had types of sex with (2 girls) and kissed many too. His reason is because he thought I was cheating on him too (I wasn't). I'm not sure if I should forgive him or let go. Please help.