^^ I agree with that.
Jasper seems to me, to at the least be a very protective character, and the things that he does love are under this fierce protection. Because of the way he senses feelings, I think that He could tell what could be threatening and what may not be so.
Maybe he is fiercly protective of Alice after what happened to all the vampires he saw. They were mostly all either ripped apart or died in battle and after a while he must have started to believe that all vampires were like that- and still does not completely trust all the vampires around himself and Alice. But he seems to trust Alice alot, even after the two years they were together and she was one of the only rational vampires he had ever met, and yet he let her drag him to a new unknown covern of vampires she had seen in a vision. Thats love.
It changed him in a way, because I can imagine him being very withdrawn and quiet before he was changed, but with the things he had to do- that were at the time nessasary- but he now could probably see that they could have been resolved in another way. He is complex in my opionion, he doesnt just think in one certain way, situations matter, for example in Bree Tanner, [mod edit to invisible font:] he feels that she might be a threat to the family and Alice and is immediatly prepared to kill her even as she has surrendered- and the way in New Moon that Alice would not tell him where she was going as he would follow and avange her. He knows when to follow orders, like in New Moon when he does not feel like going back to Bella is the right thing, but you know the person he trusts the most is Alice, shown in BD when they leave and he does not question it. Maybe he thinks that because of his past and his guilt that he does not deserve to be in the Cullen family fold, or maybe because he is quite quiet that he likes to stick to the outsides. I think it is personal choice before then that he is not he central family as Alice is accepted.
::Team Jasper & Paul::
Sometimes life brings miracles, it brought me Twilight.