Well, loyal may not be the right word, but you get what I meant. He makes strong attachments.And his loyalty was Stalking Buffy , abusing a mentally ill Buffy , Trying to rape her, he bragged like a sixteen year old school boy about being with Buffy to Angel , but not about him trying to rape her...there is and was only one thing Spike was loyal to that was Spike
Spike being loyal to Spike. Sort of. When he comes back to Sunnidale in season 3, he calls himself "love's bitch". Of course, it is a good life lesson to know that those that genuinely love you can still hurt you.