I didn't find the ending last night to becontroversial or give any indication of animminent breakup. The information thatMeredith gave Beckett was allone sided & made Castle thefall guy for theirmarriage falling apart. Boiled down what I heard was I was an open book letting Rick know everything about me, while he was emotionally distant so I moved on. The only example she could provide was that she could never find out about his father. Hardly what I would call emotionally distant or unavailable, since he may not know who his father is or may know but he has never been part of his life. He's uncomfortable talking about hisabsentee father is hardly the entire reason for amarriagebreakup, but is something I could see an ex using to deflect any blame from her.
Beckett's reaction is the realization that Castle has unresolved issues from his past, & I think it could bring them closer together. Just like Castle wanting to help Beckett solve her mom's murder, she will want to help Castle either find closer about his father or help start a dialogue between the two. Sure in the end they could breakup but that's also realistic.