Did not see the title.

So if the situation is so severe that you are afraid that you are about to lose him, and you believe in therapy, then you must get into couples therapy ASAP. If the situation is urgent, as per the title, you should apply crisis-mode measures. Individual therapy for you is probably not the most straightforward way to address the problem, even if, theoretically, it might be effective eventually (??), so it does not qualify as crisis mode intervention.