Just chill. Stop hounding him every time you have an emotion. Stop clinging and just trust.
Build up your own life with things that please and interest you. This will increase your self-confidence and naturally insecurity will diminish.
jealously is a wasted emotion ...Be better then that..
You're going to have to dig deeper and take a deep breath before you react. Also, when I was your age, I was a lot more impulsive and moody than I am now. Some of it may just be due to age and hormones. Keep telling yourself not to sweat the small stuff.
Well try to trust and love him more..buy him a gift go for a walk together and talk.