According to Match.com and Yahoo.com, the second sign that your significant other may cheat is if they are emotionally absent. If you constantly feel like you have to pry the truth from your partner, this should be a warning sign. A person like this may find it easy to tell you what you want to hear, but find it difficult to deliver on their promises to spend more time together when push comes to shove. The same thing may go for promises to spend more time together, they may promise it and never deliver.
If you sense that your significant other is emotionally absent from the relationship, be careful. It may be sign that they are likely to cheat.