I'm sorry to hear...you are truly a survivor who is overcoming many obstacles in life.

If you cannot escape physically for now, you can try to give yourself a mental break from thinking about this person. I know it's not going to change the reality. But your mind gets a break. I'm not a therapist so I don't know the best method for you. But I'm going to share what helped me.

1). Being in the moment. Doing something I enjoy with someone I like (or by myself) and commit to being in the moment and not think about that person for that 20, 30, 60, minutes, or so (Gradually increase time as you get into the habit).

2). Guided mediation. You imagine yourself at peace, like by a waterfall, or at the beach, where no one is there to harm you, etc.

Sending positive thoughts your way,
Ennie