Sure it can be. The symtpoms listed as part of BPD can be things that are not obvious to us. And we develop ways of dealing with the fears that can be part of the symptoms but don't seem like it. For example, a person who is extremely fearful of rejection may not have volatile relationships, but instead may have learned that avoiding relationships means avoiding the hurt as well, so they may have relationships that seem calm and steady on the surface. Those relationships can also feel empty or unfulfilling because intimacy is being avoided.

So I guess I'm saying that the same underlying feelings and fears can lead one person toward volatile relationships ("Don't leave me!") or toward avoiding relationships or avoiding meaningful relationships ("If you do leave me, which I expect, I won't feel hurt because I haven't let you get close.")