I genuinely want a sm perspective on this. And I am prepared to be shot down as name suggests.
Things with ex still v messy and yes he did go off with OW.
DCs have met OW - no overnights because of the mess at present.
I have real problems because of whole situation and my feelings about how dishonestly ex behaved in lots of ways, mess, unhealthy relationships, which I want to protect DCs from.
No contact between me, ex and OW. I get anxious that DCs and I will bump into her in town and I'll have no idea who this person is. I have made my feelings known that I won't support or big up GF in their lives ... that is all really.
I don't want to just suck it up, it simply feels wrong.