An attachment is an act of handing out one end of a ribbon to someone while you are holding the other end. A person might be very comfortable with attachments, and another person might feel very insecure. While one might have a bundle of ribbons to hand out to everyone, the next person might only have three. That's why he's choosing very carefully of who he's going to trust those ribbons to. And to make matters more complex, the one with rolls of ribbons might eventually stop giving out so much ribbons because he wrongly chose ribbon-keepers who took advantage of his generousity and cut the ribbons in the end.
The ribbon may represent trust, time, money, effort, or everything all together, that depends on how you see it. But how twisted an attachment can be, scares another person, whose amount of ribbons, well, is not very important.