My opinion......It's not right to have a relationship that will even remotely take his thoughts away from his marriage. If you can't control yourself & your emotions about this situation, you need to leave it alone. It's not right for you to even tempt him to get distracted from his marriage....you know it's wrong morally & ethically. If you can't control your relationship or your feelings & keep them to just the classroom communication, you need to drop it & just leave him alone.