Why do we still feel insecure?

Maybe_1day
We love, we trust and no doubt there... but why do we still feel insecure?
How many out there loves and trusts their partner but still feel insecure?
In most case it happens out of jealousy (even if not extreme) or when they are friends or in communication with the opposite genders.
How can we overcome this unnecessary insecurity?
After all we don't wanna ruin the good relationship we have, and also they haven't done anything to cause it. It's just a stigma built within inside us and it's becoming toxic.
Why do we still feel insecure?
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