Am feeling a bit wretched and furious
with dp who failed to tell me that a new employee (he's the boss) is an ex and that she accompanied him on a business trip.
I found out after they returned and still he didn't tell me she was an ex until I put two and two together in the middle of last night, did some middle of the night googling
and realised who she was.
I confronted him (he was away on another trip - with her AGAIN!) did the whole 'why didn't you tell me and don't give me that "because I knew you'd be like this" crap'.
He did little to reassure me but it was even later in the middle of the night where he was 
He's back tonight and I am still reeling.
Not sure where to go from here...