I'm in the camp that feels you need to stay as far away from anything to do with him and anyone else he is involved with as you possibly can.
There is someone else who is your priority to protect now. This person (GF) is an adult who has other people in her life with whom to consult on what's going on in her life. Personally I don't think you should even know who his current girlfriend is!!! You aren't the one to protect others from Jason.
Just my humble opinion.
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