Most Helpful Guy
There is no early signs for the future other than personality traits.
Most of the personality traits that women like in men are with guys whom are prone to cheat. Popular, social status, loudmouth, obnoxious, extremely confidence, obsession with sports, ones who attend bars and clubs a lot are types are prone to cheating. That doesn't mean that they all are cheaters though but a larger majority of them will be.
With women is not possible to tell. All types of women tend to cheat at random. You just never know.
There are tons of signs that some IS cheating though if it's current.0THIS IS NOT RELEVANT ANYMORE
Most Helpful Girl
Statistically, if he has family/friends that think cheating is okay and if he has cheated in the past, then he is likely to cheat. Other than that, it's really hard to tell.
Honestly, the most you can do is find someone that you trust, and hope it works out, after all they are doing the same, finding someone they trust and hoping you don't cheat in the future.0THIS IS NOT RELEVANT ANYMORE