I'm not quite sure what's been happening, but lately my mind been screaming at me to distance myself from my best friend. 

I'm not quite sure why because I love them and want to be with them forever and I would honestly marry them if only I didn't think they deserved better than me. 

But I'm terrified of getting closer to them, despite how close we already are. I'm terrified of being around them, and not in the "oh I'm nervous around my crush" type of way, but the "oh my gosh I'm claustrophobic, stay away from me, stop sticking so close it scares me" type of way. 

This has never happened to me before and I'm not sure what to do because it's making me want to run away from them. To cut off all contact and never speak to them again. 

But I love them and don't want to, but my anxiety is screaming at me to and I'm so scared and I don't know what to do. 

Please help.