For those who have a "secure" attachment to your SO/partner, how did you get that? Was it just slowly formed over time? Did you have to deal with being either preoccupied or dismissive for a while before you developed the secure attachment? Did the commitment in the relationship help (marriage or exclusive long-term commitment)? For those who also had an insecure (fearful, preoccupied, or dismissive) attachment to your best friend, what's the difference between your SO/partner and your best friend? Why are you securely attached to one and insecurely attached to the other?