I have been with my boyfriend for 3 years. Every now and then he says that my vagina gets loose. I'm not doing anything for it to change sizes. He thinks I'm cheating on him and I'm not. I don't know what to do. I'm so speechless when he says whats going on, why is it like this. What am I supposed to say to him if I'm not doing anything? And what makes it feel different to him?...