I don’t feel complete without my ex in my life what does this mean?😐

you need to stop relying on others for your happiness.

You are not over it.

It means you can't forget the good times you had and you believe if you took another route, you could make it work.

If it’s an ex
It’s for a reason
It’s like giving up an addiction
Your mind and body will adjust

I think it depends on how you want/need him in your life, and also the circumstances around your break-up.