The saying is "once a cheater, always a cheater. So maybe that is why Donald Trump is weighing in on Robert Pattinson taking Kristen Stewart back after her much publicized affair with director Rupert Sanders.

Donald tweeted saying Robert "should not take back Kristen Stewart because she cheated on him like a dog and will do it again." He went on to say he is 100 percent certain she will cheat again.

So this leads to the question, "once a cheater, always a cheater?

I don't think this is always the case. I think there are some who are in unhappy relationships and are afraid to get out of it for some reason and are searching for happiness and end up cheating but when they find the "one" they are faithful. However, I think some people are just cheaters, they are always looking for something different, something better and it has more to do with them than anything else.

So what's your opinion, once a cheater, always a cheat?