1. He starts paying more attention to his looks and wardrobeMost people are keen to come across well when they first embark on a new relationship and this red flag can be an indication that there is someone else on the horizon. Life coach and relationships expert, Rebekah Fensome, warns that taking a greater interest in his appearance could be a bad sign. "Maybe he just wants to start taking pride in his appearance, but this can be a sure sign that there is someone else he is trying to impress."
"This is generally a sign he's looking to impress someone new, or that someone new is putting her influence on the way he looks," says Lisa Daily, a dating expert who is regularly featured on the nationally-syndicated Daytime television show and author of Stop Getting Dumped! and How to Date Like a Grown-Up.
Dating coach, Peter Spalton (known in the UK as the "Dating Doctor") suggests that you should pay attention to when the attention to detail occurs. "The problem is when he only gets dressed up when he goes out without you either in the evening with his "mates" or for dress-down Friday at work."
Red-Flag Meter: 5/5
2. His father had a history of being unfaithfulYou might assume that people are capable of making their own decisions and that what your parents did has no bearing on your own future conduct but for Armstrong, this isn't necessarily the case. "All of us are unconsciously influenced by our parents' behavior and even if it has been a 'secret', the subconscious mind is powerful and absorbs the behaviour and influences."
For Daily, the outcome is less clear-cut. "Men in this situation tend to go to extremes: He'll either be the most faithful guy on the planet (because he remembers vividly the fallout in his family), or he'll be socialized that cheating is normal."
Spalton, on the other hand, is not convinced that a family history of infidelity has any impact on behavior. "This is unlikely to be an issue," he argues. "If his parents split up because of an affair, he'll probably go out of his way to make sure it doesn't happen to your children (if you have any). After all he personally knows the impact a divorce can have on the kids."