Physical therapist said I might have a miniscal tear, should I get a MRI or something?

she said I might have a small miniscal tear, but it wont get worse,which doesnt make sense? to me at least cause im not a doctor it seems like if i keep doing kickboxing 5 days a week which is how i hurt it in the first place I will keep hurting it?? Should I get a mri done? She didnt really tell me what to do...