Stay calm and business like. When this happens, think about where you want to be and how far have you come. Most importantly, know that you are not the problem! There will be no more fights because he is jealous. That the person they're currently with will leave them.
Reassurance is one of the greatest things you can give them.
Dating someone with abandonment issues: is it hard?
And they are genuinely sorry for being like this. Try to communicate your concerns before it boils over. These are the kind of scars we wear for a long time, not being aware we have issues in the first place. Avoid taking this personally when he accuses you of being late or neglecting him. Life's Not Easy. The selfless lovers are those who fear loss.