I have a fear of abandonment too. And I also take it personally. My T and I are terminating long-term therapy. I keep feeling like she's leaving me. I talk to her about all my fears. We play out scenarios so I know what to expect if x happens. And even taking things personally, I address with her. Just this week I asked her if she's leaving me because of my faults, secret, lack of progress. Her response was that she's not leaving me (therefore it's none of those reasons). The reassurance really helps me.

Talk to your T directly about it. Get some reassurance when you need it.