Overthinking

Let's say I told a guy I'm talking on the phone with that I'm dealing with a chronic illness (it's the truth!) bc I needed to explain why I was being so distant (therapy) and not being able to call for a few hours.

I did not specify which illness though, (inflammatory disease of the central nervous system) and I said that we can talk about it more seriously over a cup of coffee once this corona virus settles down.

I know he is a serial overthinker and will try anything to help anyone really. Is it my fault if he overthinks too much and can't focus on his job?

My dad told me I should have told him right away what my illness is, so he could decide whether or not to talk/flirt to me. But I feel weird about it. Idk. Help please.