Beat It

As she tells you about a night out with male colleagues, your protective instincts are aroused, triggering a pounding heart and a rush of adrenaline. Manage your clinginess with specialist advice on trust and jealousy from a relationship counsellor.

Breathe Easy

Air is sucked in through your trachea, down to your lungs' alveoli - where your agitated breaths fuel your jealous heart. Continue this hot-blooded practice and you could treble your risk of breathing difficulties in later years. If you're paranoid about her running off, get hitched. Yale researchers have found that married couples are 30 per cent less likely to experience jealousy on a day-to-day basis.

Brain Drain

Your amygdala - the part of the brain dealing with emotions - perceives a threat and puts your body on alert. It releases the stress-hormone norepinephrine, causing fear and anger, which you experience as jealousy. University of Georgia researchers have found the best way to reassert your faith is to wait, do nothing and then watch her give the creep the brush off.

Butterflies
As she rebuffs your jealous line of questioning, you experience a crushing sensation in your stomach. As you fear for your relationship, trace amounts of adrenaline are released, leaving you with that unpleasant gut feeling. Minimise butterflies by taking deep breaths. Britain's National Institute of Anxiety and Stress found slow inhalations slash stress by 15 per cent.