My husband is in love with his student. I have no ****ing idea what to do.

Edit; I?ve decided to talk to him. I know I?ve been avoiding this since months but after reading all the responses, I feel it?s time I rip that bandaid out. I?m going over to our house. I?ll update on what happens.
My husband and I (both 35 rn) met in college. We fell in love and got married 8 years back. I gave birth to our daughter in 2020. My husband is a professor at this med school (he?s a doctor himself). My friend, Sarah, also works in the same college and she?s in the same department as my husband.
Few months back(in December), Sarah took me out for lunch and told me that she suspected something?s going on between my husband and this med student (25f). She claimed she?d seen both of them give ?yearning looks? to each other. She said that she?s known my husband for so long, and she?d never seen him talk to any other woman like this, that he?d been so aloof around women all these years, but it?s just different with this one girl.
In that moment, I had laughed at her face. I remember telling her that she?s jumping to conclusions based on these supposed ?yearning looks?.
?That?s why I didn't tell you before", she had said,"I was confused too. It's not like he goes out of his way to talk to her but whenever they do talk, it?s like watching a slow burn romance movie. She looks at him like he?s Brad Pitt and he looks at her the way he used to look at you.? I remember the exact word?s because they stung. Internally I was breaking down, externally I just smiled and told her that she?s probably overthinking.
That night, I casually mentioned this my husband. I was laughing at the absurdity, and I expected him to join in. And deny the wild possibility that he?s in love with a student. But he didn?t. Instead he looked at me, all teary eyed, and said ?I?m sorry?.
? I can?t get her out of my mind. I?ve tried, trust me. I should?ve told you sooner. But I thought I could save our relationship, I really wanted to.?
I asked him if he?d cheated on me. He said no. He said he didn?t even talk to her, nor did they have any contact outside of college and that he completely understood how morally depraved it is to try and pursue a relationship with a student. She wrote him a letter about an year back, confessing her love for him and he had told her that even tho he was into her, nothing would come out of it. Aparently that was when the ?yearning looks? had started.
I honestly don?t remember how I reacted then. I think I just started packing and came to live with my parents along with my daughter. I?ve been living with my parents since then. Half of me wanted him to come and beg for forgiveness. But he never did. He comes by sometimes to spend time with our daughter but that?s it. He never talks about the elephant in the room nor do I bring it up.
I keep checking that girl?s social media. She?s insanely beautiful, almost doll like, and intelligent. I can?t help but think that someone like him should be with someone like her. He?s always been very good looking and I?m more of a plain Jane. She?s the Meredith to his Derek.
I don?t know what to do. What do I even tell people? I don?t even know who I am without him. Some part of me still wants him to come back.
TL;DR husband just admitted that he?s in love with this young woman who also his student. She loves him too.


Source.