After a split in our relationship. We were together since we both were very young. We had a big argument and we split for a few months. My girlfriend started to date another guy (who was huge) and she discovered a new world. Fortunatelly the guy was a jerk and he left her because he cheated her with another lady and my girlfriend came back with me. But after that, she was quite different during the sex with me and I asked her why, and she confessed she enjoyed much more with the other guy but she didn't want me to feel bad. I felt bad, I funcking felt really bad. But this started my cuckold kink and today we are doing this since two years now.