Insecurity in a relationship - advice needed

I have been in a relationship for about 6 months and we are very close and trust each other and rarely ever fight, but I often find myself worrying so much that something bad will happen and I will lose him. He means so much to me and I cannot picture being with anyone else.

It scares me so much and I know these thoughts are irrational since everything has been going well but it drives me crazy. I am in love with him but we have not said that to each other yet. We were both broken in the past and afraid of getting into a relationship but it happened naturally because we like each other so much.

I was waiting to determine if I really was and now that I’m sure that I have fallen for him, I feel like I’m in constant worry and anxiety. I love the feeling of being in love but at the same time I get worried about every single little thing.

Does anyone have any advice on how to reduce this insecurity and constant anxiety? It is driving me insane 😢