My friend who is 15 and one of the teachers in my school who is 37 like each other.

At first I don't think anything of it because he was a teacher and a lot of students are friends with teachers in my school. They would talk a lot on the phone and this is where I started to get concern but my friend (who is a girl) said that nothing was going on.

she recently told me that she told the teacher that she liked him .I am not sure exactly what he said but he likes her to. This was more than a month ago I am the first and only person she told . If the wrong person fines out it will cause a lot of problems for everyone. But there are rumors that they like each other but that was just jokes from the other students. another teacher heard this so they are being watched. She is my best friend and I want to help her not hurt her.

Her parents don't know and the teacher she likes went to school with her parents if they found out I don't know what they would do but it won't be pretty.

Should I tell someone and try to stop it before something happens OR let them do what they want ?

P.S. nothing sexual has happened I think.