You may feel jealous while your lover does nothing wrong.
As a result you may be inclined to keep an eye on your lover all the time. You might look for ways to restrict your lover’s freedom of movement. If he or she for instance at a party talks to someone else you may join them as soon as you notice it. You may also check his or her email addresses and carefully listen when someone is on the phone, trying to make sure nothing happens behind your back.
By trying to restrict the freedom of your lover you increase the chance that your fears become reality. If you misread the intentions of your lover over and over again the relationship becomes oppressive, making your lover withdraw. He or she will seek the company of others, which will strengthen your jealousy. A break up will be the expected result.

What can you do to prevent this course of action?