So he's back on TRT and the issue is he can't stop thinking about banging other women. That's totally normal.
Are you hurt that he told you that? Because I could see how many spouses wouldn't want to hear that from their mate.
If so, then it's not a TRT issue but the fact that your husband was disrespectful or knowing you've agreed to a fmf in the past, just brought it up in a really clunky way. Or he's trying to open up your relationship.
But we don't know him so you'll have to ask him.
"Honey, when you told me you can't stop thinking about having sex with other women were you trying to start a larger conversation?"