So recently, we found out that one of my classmates (let’s name him Y) is a habitual liar, and has been gaslighting us for almost a year.

On a few occasions, he would quote our professors on things that we need to do in order to fulfil certain criteria of our assignments. When we try to clarify with our professors on these “requests” later, they would say they didn’t speak to Y at all, and didn’t make any such requests. When we confront Y, he would then said he has misspoke, deny the facts or mention that we may have remembered them wrongly.

On other occasions, Y would miss some of our project meetings claiming that he was sick. But then later we had to find out from another friend X who happened to be a personal friend of him, that he was not sick and even went out with X and other friends on those times he claimed to be sick. When we confronted Y again, he continued to insist that he has been sick and say we are overreacting.

To be honest, we have no idea what has triggered Y to treat us with the toxic behaviour since we know each other from the start, and we have not offended him once yet. It has become a little difficult of late to be working with him for assignments and this behaviour of his has affected other people apparently who are not in our course.

Any advice on what we should do?