So I have a boy bestfriend of three years. We’re both in a relationship. Before we both got in relationships, our conversation would sometimes turn sexual. Not towards each other but the topics would be sexual, about his penis size or how aroused I can get. So even though we’re both in relationships our conversations would somehow think sexual again. He would e talking about him and his girlfriend having sex and how she couldn’t take it cause his dick was so big , how he lasted for two hours, or how be has sent me two pictures of his penis in the past. I find myself deleting these messages because I feel like im cheating on my boyfriend even though im not physically doing anything. I just feel wrong for engaging in sexual conversation with him. Please help me out.