Am I overreacting?

I’ve been seeing this girl for just over a month now, on Saturday she was getting threatening messages from an ex that were trying to blackmail her for sex, she told me she had blocked him on everything and that was that, or so I thought.

I went back home Sunday and found out the next day after her telling me that she had met up with the ex on Sunday night for a chat to clear the air that ended up with them back in her flat, now I am trying to work out how it is so difficult for me to ask why she unblocked him and how it happened?

Just to add I have done so much for this girl taking her to her hospital scans for her unborn child and all sorts.

Think it’s time to dead it off?