Could a school teacher be fired for having a relationship with a former student?

Futureboy
Let's say the female teacher is 35 years old and you are now 22 and she was your teacher when you were 12 years old. Would she be liable to get fired if the school knew she was dating a former student she used to teach?

I am from UK so laws in USA might be different but I don't know if our schools can fire teachers like that?
Could a school teacher be fired for having a relationship with a former student?
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