There are many things you can do to help make your relationship work, but if a partner is caught out cheating, then you should be out of there straight away. The only problem is - how will you know if they are doing the dirty on you? Cheating is a huge sign of disrespect. It can affect your trust in future partners and destroy your own self-esteem. You should always try talking through how you are feeling first and then if you still remain suspicious, you might want to probe for further clues.