I reckon ex wife.
Wife has suspicions about him and puts 2 and 2 together, and he was acting wierd. Keeps her mouth shut as they have kids, and she weighs it up in her head and decides the woman isn’t seriously hurt, so shelve it.
They’ve split as, well he’s a toxic person, and she can no longer live with the guilty knowledge (she wants him gone) and has gone to the police with evidence, timelines etc. I hope she dug the clothes out of the trash and kept it.
I don’t think I’ll be wildly off the mark when it all comes out.