Like the others have already said size isn't the only thing its how you use it. If its all you use then that would be an issue with me, there are many wonderful ways to get your partner off. Are you being creative when making love? Creative sex overcomes size and other issues. Don't give your ex a second though its over and time to move on. I would ask your current why she chose to end sex though, it may have nothing to do with your size. I went though a phase of feeling a relationship was all about sex and figured if we stopped it I could find out if he really loved me or my body.