My teen son is gay and dating a nice guy.  They dated a year ago, broke up due to trust issues, spent time apart but worked things out.  They got back together over 6 months ago.  Shortly after getting back together my husband and I were approached by both and asked if my son's partner could stay with us.  His grandmother, whom he lived with, was moving into a retirement home and he had no place else to go.  We agreed with the understanding that he was to get a job and pay us rent until he got on his feet.  (He moved her from another State).  My dilemma is this....my son goes through his partner's phone messages, computer and questions his phone calls (most are work related).  They fought almost every night.  Now my son found his partner was talking with someone just a week ago and wants him out.  He has nowhere to go as he just got a salaried job and is trying to save.  What do I do?  I feel that my son needs to talk this out with his partner but he refuses.  I know there is no excuse for cheating but I also feel my son pushed him to this point with his lack of trust.