Does the teacher's reply "I only wish for your well-being" via text messages constitute his absolution from the price of the two lessons, and if not, what should I do?

What transpired between the questioner and the teacher is insufficient to absolve the questioner of the previously incurred tuition fees, because the fundamental principle is that if a liability is certainly established, it is not discharged except with certainty. Therefore, the questioner must communicate with the teacher and give him his due share of the fees, unless the teacher explicitly states that he absolves him of it.