How is it possible my ex has herpes when my herpes test was a false positive? Is there something he’s not telling me?

I got tested for herpes and it was definitely a false positive then my ex showed me he tested positive for the herpes antibodies and claimed I gave it to him when I didn’t. It was a false positive for me because I tested positive for the antibodies and never had a positive swab and then I tested negative for the igg inhibition test. That’s the test to see if it was a false positive. I never had an outbreak. The doctor even told me. He told me I was the only girl he’s been with. Is he lying to me about only being with me? There is no way I gave him

herpes. You think he lied about only being with me and you think he had it this whole time and didn’t know? We only been together for 7 months. I never gave it to anyone else.