<human>: Over the course of our relationship I have felt constant anxiety that we might break up, regardless of how well or badly the relationship is going. We have been together for over 2 years and have recently got engaged, so for the majority of the relationship it has not been the case at all that we have been close to breaking up, apart from one or two isolated incidents which we have dealt with and moved on from. 

However, I seem to have suffered with an extreme fear of abandonment for as long as I can remember, right back to childhood when I was afraid that my parents didn't love me. If my boyfriend doesn't answer his phone for 15 minutes, he will find 37 missed calls when he picks it back up because I panicked that something was wrong. I have a diagnosis of Borderline Personality Disorder, and suffer with depression and anxiety on quite a regular basis for which I am receiving treatment. My boyfriend also suffers with mood instability, which can be difficult if we both suffer at the same time, but generally it means we understand what the other is going through.

It particularly bothers me that he recently said he would not approach me with his problems or feelings, because he thinks I can't handle them. He is right - I become consumed with worry and pressure to support him, which is completely counterproductive. I am constantly trying to earn my place as his girlfriend (and fiancee). 

I am aware that this insecurity is not an attractive characteristic and puts a lot of pressure on him to constantly reassure me. However I can't seem to be able to do anything about it. It seems to be very linked with my mental health issues but I really want to break this cycle and don't know how.

Can you condense the text into three sentences or less?
<bot>: I feel constantly afraid that my boyfriend will leave me, even if there is no reason for me to feel that way. I want to learn how to feel more secure in my relationship but don't know how.