I see your bf as the 7th, Merc, and the job as the 10th from the 7th or the radical 4th, so Jupiter.
They apply to each other, Merc by retrogradation, to a sextile, which points to an opportunity for reconciliation. I do think that while Merc is strong in its dignity, it is in detriment by retrogradation, and it does point to him "going back."
Things were pretty mutually hostile between both employer and bf when Mer was in Gem and Jup in Pisces, since they were mutually averse to each other by reception. Now that employer, Jup, has moved to Aries, employer still doesn't like your bf much by reception, but your bf will not dislike employment as much as before.
In the overall, I see a modest chance to go back to same job and I don't think the atmosphere there will be too much better. If he could find employment elsewhere it might be better for him.
Moon's next aspect is an opposition with malefic Mars, so this is also not so encouraging.