In my long past marriage, I had similar issues. What I learned is this. She did things that broke my heart. I don't think that she intentionally set out to ruin our marriage, what I think happened is that she had unfulfilled needs. Whether she knew these needs went unfulfilled or not is not necessarily the issue. But she felt compelled to fulfill them whether she told me and I was unwilling or unable to do so myself, or if she had ever even allowed me the opportunity.
I also learned that a relationship is NOT a 50/50 proposal. It is a 100% from both sides situation. We all have our off days, and on those days, when I can't cover my portion, she's got it covered for me. And vice versa.
It sounds to me that she is looking for something. She may or may not know what it is. And if she knows, she may or may not be willing to allow you to help. But when you say that this has been going on for two months, then I think she is no longer interested in covering her share and leaving it up to you to keep things together.
You said you are not the type of person to cut bait and run... Most people aren't, really. But are you the type to continue to dump resources into a bottomless pit? Each person has their own limit, and we've all found ourselves overinvested at some point or another. Only you can decide where the end is, and whether or not you've passed it. I can tell you my opinion, but it won't matter. This is your decision. But pass or fail, you and you alone have to live with the consequences.