How to handle the insecurity?
If you hope that everything will be okay if the insecurity gets over, you can save your relationship. Find out what makes your partner insecure. If your partner always complain about your friends (opposite sex to be precise), it is better to arrange a meeting and introduce your friends to him/ her. If he/she feels comfortable with them, may be then they won’t complain. However, if things remain the same, you can reconsider your choice.