Insecurity is a natural element of being human. While it may not feel nice, we all suffer from it from time to time in our careers, friendships, and life in general. Insecurity in a love connection, on the other hand, can be highly upsetting and cause you to doubt both yourself and your spouse. 
https://www.dainikastrology.com/what-does-being-secure-in-a-relationship-entail