Hiya folks.

One reason why relationships have been and continue to be a struggle for me is because, as I become attached to someone and begin to feel the warmth of love given and received, it can all drain away from me in an instant. And although it may return, I'm left feeling very insecure. 

I'll wonder whether it's just BPD, or maybe it's a sign that I don't truly love this person, or that they don't love me as they say they do. It reminds me of past relationships gone south, and I start to feel very lonely and empty.

It's not only in intimate relationships where I feel this way. It happens often when I have positive feelings towards someone or something. I could be enjoying an occasion with family and feel suddenly cold towards everyone present. Or playing with my dog, and feel my joy leave me. It's confusing and stressful, and I often lapse into self-harm.

Has anyone else experienced this draining of powerful positive emotions? How can I stop it happening, or deal with it when it does happen?