It could be BPD, but I won't say it is for certain as so many factors could be involved. What I can tell you is as a BP myself I have actually split with my wife during our rocky relationship three times because of the following reasons.
- I felt I no longer loved her
- I thought she would be better off without me
- In a fit of anger I stormed out
As you can see the reasons vary but underlying those things was my condition. I would like to second what people have said here, in particular Joe Buck when he says about information and support. I now have a support structure in place for me and my wife, if we didn't have it I'd still be heading for the door everytime a mood took me. Now I still head for the door, but there is often some common sense waiting for me.
Cadno