Ok OP if you are like that then you are going to need a bit of help!
Our attachment is rooted in childhood, by around the age of 8 we decide what type of attacher we are based on how our primary caregivers attach to us. I won't psycho analyse from my bedroom here but usually if we are not "secure" attachers then we haven't learned right somehow.
So just to start off...try and do the test again from the mind of your boyfriend, or if you are confident enough ask him to do it. If he is secure, that is ok, but if he is avoidant then you have a situatin where he is a person who needs extra distance and you are a person who needs extra closeness. Relationships are a bit about meeting each others needs so those opposing sets of needs can be hard (but not impossible) to manage.
Secondly, the root of it is fear. Afraid of abaondonment, which from the title of your thread is obviously an issue. It's difficult for me to sum up in a paragraph, but obviously you CAN work through that. It's not easy but you CAN do it.
Part of that is a bit of retraining your brain, to not "read into" the fact that he needs more space that he is going to leave you.
Part is acknowledging that you are indeed "needy", and therefore understanding no one can fill that void but you.
Part is feeling security which I guarantee NO ONE BUT YOU can provide. This is the fundamental belief that you are ok, good enough, wonderful, loveable, safe and most of all that if someone DID abandon you, it would hurt...but you would be ok!!!
I think therapy is a wonderful place to start.
Books are wonderful. this one is FANTASTIC www.amazon.co.uk/Attached-Science-Adult-Attachment-Help/dp/1585429139 and I got it on audio book and it really helped me.
Techniques like mindfulness, meditation, exerise, keeping busy will all help with any anxiety but particularly this kind.
Makign sure you have a full and wonderful life outside your partner is important.
Learning to love yourself is something you can do by acting with love towards yourself the same way that you do to DP or DCS. Take yourself on dates. Buy yourself nice things. Say nice things to yourself. Surround yourself with people who make you feel wonderful.
These issues come from people with troubled childhoods or parents who were emotionally unavailable or in some way failing at their job.
IT IS NOT YOUR FAULT.
You can stop punishing yourself and living out your insecurity and grow the ability to attach securely to your DP in the same way that you probably do with your DCs and friends. I am sure you don't worry your friends stopped loving you if they are a bit off one day. you are capable of this security in relationships and you can learn to create it for yourself.
Maybe set this goal for 2016?
If your DP is a good man, he will listen to this, and perhaps hold your hand in support as you work through it.
If he is an avoidant attacher, he needs help of his own! Possibly more than you, as those types are very painful to love as they always hold something back