Doubt

Hey everyone, I have a quick question. I just binged The Dragon Reborn**, and there's one thing I'm really confused about. Regarding Thom, it keeps being mentioned that he used to have a thing with Morgase, but I can't tell if they were actually in a relationship or if Thom is just blowing smoke. I'm not sure if I missed some key details. Could someone clarify if this is legit or just Thom messing around?**

I'd love an answer, but please**: if this gets brought up or revealed later in the series,whether it's a joke or not, no spoilers. Just tell me to keep reading. But if it's something I already overlooked and should definitely know by the end of book three, please fill me in, because every time this guy hints that he and Morgase used to be lovers, I get completely lost**

PLEASE SPOILERS FREE. Just tell me in case I missed it