Ally, I cannot answer your question on when will you ever feel safe to feel happy again.

You have felt happy before and there is no reason why you cannot do so again.  Trust that. Trust yourself in being able to do so again.

Can you sit quietly and capture that safe feeling in your body?  When you find that safe feeling, where does it show up in your body?  Hang out there.  Hold that feeling like a baby.  Stay with it.  Allow it to permeate your whole being.   Smile when you are feeling that.

There is a Metta meditation that goes into feeling safe which is a good practice.  You can Google that.  Susan Saltzberg has a good video of that.

Hugs,
Mark