How to break up with a cheater when yall live together?

Marie

So my man been out cheating, i have a idea on where he is nad who he'scheating with. But i just want to be done with him and move on with my life, we live together and he has things here, plus his youger sister and her girlfriend lives here with us. Wat should i do? How do i break it off with him? I can tell him to take his things but he still has access to my home because his sister lives here.