meninlove said Not enough info to comment.
So I'll ask....why are you separated?
Agree, nor do we know anything about you individually. Some guys might respond well to a direct approach from you, with others it's better to step back for a cooling-off period, when the problem will heal itself.
My own partner tends to fall into the "step back" category, just let his volcanic Sicilian temper burn itself out. The more you say, the more you fuel it, the longer it lasts. I have a damn good temper myself (the Irish side), but I've learned to curtail it with him. I get better results by saying & doing nothing, just keeping my mouth shut (now THAT'S hard!).
What will work in this situation I can't guess. But you oughta know your own guy. Do whatever you think will get results with HIM, not with other guys' BFs here, and certainly not with mine. Pursue him, or bide your time. Either can work, depending on your man.