Dear Debido:

Did I understand correctly: the first two years you dated him, this other woman was living with him?

You wrote that your boyfriend said:  “she is needy and emotionally unstable, he considers her as his best friend”-

If he is emotionally stable, it seems incongruent to me, for an emotionally stable  person  to consider an emotionally unstable person a “best friend”-

“Best friend”, to me, suggests a compatibility of emotional stability.

anita