“It´s human nature for a man to test the waters”, says Argov, “he wants to see how much he can get away with.” Here are the three reasons why the man who seems to like you will pull away: Most men deliberately don´t call just to see how you´ll respond.

From this data, experts estimate that of the 33million Britons currently in a relationship, two per cent - some 588,000 people - were found to be in stage one, or "butterflies".

Ten per cent of Britons in love are believed to be in stage three – "assimilation".

That one thing you do is really weird and I'm not completely into it.

I don't want to have a fight because I hate fighting but I'm also mad at you. I'm glad you told me about it and actually, you handled it pretty well, and you know what, I handled it pretty well too. Again, it's cool though because they don't really matter and all your other qualities are seriously top notch.

This stage is characterised by a spiral in stress levels and an anxious re-evaluation of your significant other and whether he or she is right for you.

According to the research, things don't improve much in stage four – "honesty" – which is triggered by a greater openness in the relationship which breeds feeling of doubt and increased vulnerability.

Psychologist Dr Linda Papadopoulos, who assisted with the research, said: "Shaped via a mixture of physical and emotional indicators, it's fascinating to note that this one core emotion can be broken down into such distinct stages.

"What's more, each stage may be relived and recaptured as couples grow into a relationship, and face different life challenges together."The couples filled with questions about how the relationship impacted various aspects of their lives.

"So, if you're not sure what title to bestow upon him, remove all awkwardness—and wordiness—and stick with his name.