What’s wrong?

My husband doesn’t initiate sex with me. I often overlooked this and asked him about it but he would always say “he will start too” but never did. My husband was raped as a young boy and I recently found some gay man writing him on FB. My husband wasn’t talking dirty or flirting with him. But the guy was. My husband also didn’t delete him. I confronted him and he got so mad he almost hit me. He swears he’s not Bi or Gay and that I’m crazy to even think that. He said he’s willing to take a lie detector to prove himself. He’s currently looking for someone to talk too for therapy. Am I looking way too into it? Or should I be worried?