If he has a girlfriend why do I still feel guilty sexting with other guys?

Anonymous
There’s this guy I really like we’ve been talking since before he had a girlfriend so it’s been a few years now. He wanted to date me last year but I was in a relationship myself then. I would still talk to him even though I was with someone else because there’s always just been something about him. We grew feelings for each other. We technically never met but we developed a deep emotional connection. When he was single he wanted me and now I’m single and I want him. It’s like we could be great together but the timing keeps sucking. Even though I was in a relationship and never met him I still wanted him and even though he’s in a relationship, he still wants me. His girlfriend lives in another country it’s a long distance relationship. I’m not sure if she even speaks that good of English so I really feel like he can connect more with me. We spend hours on the phone and he says I’m his favorite person to talk to. He says I brighten his day and cheer him up when he’s depressed. He sends me sweet good morning texts every day. He told me he can’t get me out of his head. So the fact that he has a girlfriend why do I still feel guilty about sexting with another guy? The guy I was sexting with trains him at the gym he goes to. They know each other so I’m worried he’s going to find out and not want anything to do with me. But we aren’t together, it’s not like I’m cheating I’m single. I can flirt with any guy I want right? What’s wrong with me? Why do I feel like it’s wrong? Am I overthinking this?
If he has a girlfriend why do I still feel guilty sexting with other guys?
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