Being in the house obviously makes this situation worse for the fact that Lawson can't just go to Candice and end it. She has to suffer through watching this and have to wait till he's evicted.
I've been cheated on before, twice to be honest with you. It sucks yes, it hurt like hell, but we were able to discuss it and talk it out face to face. Lawson can't do that and that's obviously the main issue.
I don't condone it at all, because it never ends well, but I can see his point. You can't help who you fall in love with.