My husband is still in love and having an emotional affair with his college girlfriend

My husband 37m of 6 years (no kids) has been having an emotional affair with his college sweetheart 36f who broke his heart many years ago by needing to take a "break" to move for her career. He apparently took the break so badly that she decided to go no contact because keeping in touch was hurting him but she always hoped they would reunite.

According to the texts I read, he forced himself to move on and married me but he isn't happy. I know now that I am someone he settled for. Essentially unprovoked , he texted that he never stopped loving her , he can't stop thinking about her, that he always wanted to reach out to her but thought she had moved on. that he was trying to figure out a way to visit her but "his wife would kill him if she found out". There was nothing sexually suggestive in the texts which kind of hurts even more for some reason.

She said she never stopped loving him either but wouldn't consider anything further until he was at least separated. He said that would be difficult because it would come as such a shock to his wife (me).

I am shocked and devastated. Everything about those texts suggests that he wants to be with this woman. She has no kids and never been married. He didn't seem to care about my feelings or anything , only that things would be difficult because I woulld be angry and our families would be in shock.

I don't know what to do.