Overcoming relationship insecurity is partly about becoming less controlling. This may sound strange, but feeling that: “This relationship must be exactly as I think it should be!” is a form of over-control. A sign of insecurity in relationships is when the desire for certainty becomes too strong.
Having to know whether your partner really loves you, having to know this or having to know that puts a lot of unnecessary strain and tension into the relationship. The fact is, we all have to live with uncertainty. Insecure people can still feel insecure even when they are told they are loved. Wanting what is not possible (complete and utter certainty in all and everything forever) is not possible because imagination can still make up doubts. So stop looking for certainty where it doesn’t apply.
Self-assurance comes from starting to relax with uncertainty. Wanting to know for certain that someone will be with you forever prevents you enjoying the here and now. Nothing in life is certain.