Lean into this (as you may be projecting these beliefs onto your twin):
Where is the fear coming from? The fear is a messenger, it is telling there is some unhealed wound it's trying to protect you from.
ie. it could be that you're prone to fearing the worst case scenario as a means of trying to prevent pain and suffering. But ultimately you are just in fear that something is going to happen again, something that once caused you emotional pain. What was that something? That's your wound.
What to do with it now?
Acknowledge it, release any ownership over that belief and establish your own beliefs about unconditional love. Being aware of where this pattern came from will help you to establish that you most likely took on someone else's version of the truth.
You were and are now worthy of the most beautiful love, as you are in this moment.
Imagine only the best case scenario for all involved, knowing and believing that you are here to experience life and that you are deserving of amazing, magical experiences too.