Me & my SO have been together nearly 3 years and the first year we got together he was messaging other women on all sorts of sites I confronted him and he admitted that he was sorry he promised to never do it again and as far as I know he hasn't anyway now a days if I bring it up or say anything he will denie he even done it I don't know if this is a good thing or he's pretending to himself he never done it to not feel so guilty I don't know any advice please?