Learningtolive2013,
Thanks for posting! Welcome!
First: You are ENTITLED TO YOUR EMOTIONS.
You are a human being. Part of being a human being is experiencing emotions. Regardless if you think they are irrational or not - they are still legitimate feelings and you still experience them. There is nothing you can do BUT - experience them. So why be hard on yourself? You cannot very well NOT be a human being, can you? If you take away your ability to express your emotions and have feelings - you may as well decide not to be human.
So yes! Your feelings are legitimate. Trust them! "
BEFRIEND YOUR EMOTIONS!" They can tell you many things about yourself. There is a REASON why you are experiencing them.

Most people don't know why they are experiencing emotions in the first place, however, you seem to know exactly - what is causing your emotions to come up - hence, you are having difficulties with your husband and the relationship - and you are seeking advice with whether or not your feelings are associated with, "BPD thinking/feelings vs. legitimate thinking/feelings."
What I am trying to say is - sometimes we with BPD - can over-think, ruminate - and come to believe a negative thought when in reality - it holds no FACTUAL basis. Of course we do that. But ALL HUMANS DO THAT. It isn't something that is unique to Borderline Personality Disorder, nor is it something that is only found in mental illness in general. It is a human trait. So please - give yourself some slack. Yes, sometimes you will be wrong, sometimes you will over think things and sometimes it will lead to more problems - [had you not believed it in the first place] - but you are human, so
do NOT feel guilty for having FEELINGS and EMOTIONS.
Trust yourself = Befriending Emotions
I hope that helps in some way,
Thanks,
HD7970Ghz