16/09/2016 1:11 PM AEST | Updated 16/09/2016 1:11 PM AEST

What To Do When A Green-Eyed Monster Attacks Your Relationship

It's not love that is blind, it's jealousy.

"Honey, who are you texting?"
"Honey, who are you texting?"

Sexual jealousy is like a toxic weed -- if it isn't rooted out it will suffocate and poison a relationship, turning passion into paranoia. The saying "love is blind" isn't strictly true, jealousy is certainly blind.

A couple in their early thirties came to see me. They had been together for about a year. When they met, she noticed that he was jealous but she was flattered because she felt he really must care for her and love her. However, by then, the intensity of his unwarranted jealousy was tearing them apart.

He didn't like her talking to male friends or colleagues and he accused her of flirting with them. When she went out with her girlfriends, he texted her every hour to find out what she was up to. Just last month she realised he had been secretly checking her emails and mobile phone.

She had become anxious, felt she'd lost her freedom and was driven mad by his clinging. She threatened to leave him if he did not come to counselling and he very reluctantly agreed.

Why was he so jealous? His ex-partner had cheated on him and he'd never got over it, he believed he was made to look like a fool, lost his confidence and had a real fear it would happen again.

His hurt was so overwhelming that he never told her how his last relationship ended. Trust is the cornerstone of any relationship and it's very insulting when your partner doubts you or your behaviour. In the long run, constant questioning can be as destructive as having an affair. He realised he was creating imaginary threats, tormenting her and himself, and after some counselling sessions he is able to manage his emotions better now.

I have spoken to many couples where one of the partners has some sort of sexual jealousy. Some people have such a fear their partners may be unfaithful they use social media such as Facebook to check on which friends they are talking to. They sometimes even insist on having access to their partners' emails and mobile phones. Why not, they say, if he or she has nothing to hide?

Jealousy also rears its head after one of the partners has had an affair, fling or other sexual indiscretion. Whatever the reason for it, infidelity has an often devastating effect on a relationship and it's easy to understand that jealousy will play a big part in it.

Some people are extremely jealous of their partner's sexual past; they believe former partners may have been more experienced or better lovers than they are. They're often so insecure they can't stop asking questions and wanting to know details even when it is self-destructive.

In extreme cases, sexual jealousy can sometimes be the motive for a man to kill the partner who wants to leave him; his reason often being "if I can't have her nobody else will!" This stems from the idea that our partners belong to us, but people are not possessions and our partners don't own us. Owning is the opposite of loving.

Most issues in a relationship can be fixed, but jealousy is a hard habit to break. If a jealous person refuses to change or admit that he or she is in the wrong, the relationship will remain unhealthy. Being jealous is a very powerful emotion, and it is difficult to control because it's being fed by one continuous thought: is my partner being unfaithful?

Jealousy has a lot to do with self-esteem. If you are happy with yourself and confident in your own skin you are much more likely to think: why would my partner want anyone else when they are lucky enough to have me!

A healthy ego is the best protection against jealousy.

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