From what you have shared and your wife's age, I honestly have a strong feeling that she is tired of living her life around the challenges "others" have handed her and she did not really get to enjoy certain freedoms where she could just focus on herself and having fun and being young and single with little worries and responsibilities.

Her age is definitely an age where this "life resentments and desires for freedom" tends to come out. Honestly, I think this separation is an attempt of hers to find some personal freedoms for a change. I don't think it's really YOU that is boring either, instead it was the entire life she was living that has weighed her down. After all, she had to live her life around a child with challenges when she was still very young herself and that has put her in a trap she has grown tired of. You sound very structured and committed and you are also older and more mature and you have enjoyed engaging in working and having your own personal gains too. I am wondering if she has had any of that kind of freedom herself. did she ever work and have her own career? Or was her life constantly all about caring for a child and HAVING to be committed to that constantly?