Hi Lilly
Just have a heart to heart chat with your partner and explain how you feel. Share your fears with him. If he is meant for you, he will understand and support you and your relationship will grow. If he doesnt, that is his loss. Either way, you will be doing yourself a favour.
It is sometimes natural to feel insecure when life is great and you have an amazing partner. However, dont let this insecurity create a bridge of doubt between the 2 of you.
Feel grateful for what you have and appreciate it even more. Love breeds love.
Lots of positive energy your way,
J