No , Julia did not use Spike for any reason for if she had she would not have had the difficulties she went through had she killed Spike when Vicious and the Red Dragon crime syndicate wanted her to so I do not see how she 'used' Spike because it resulted in her death , and Spikes' , when they sought to get out of the syndicate when they finally found each other .
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It is unknown whether Spike is really dead. Director Shinichiro Watanabe stated that, "I've never officially said that he's died. At this point, I can tell you that I'm not sure if he's alive or dead."
For us fans/viewers, we don't know the true reason why they are in a fight of some kind. On many occasions on Ustream Tyler replied that they both parted ways singing/career wise. Tyler and his band wanted to stick with singing all sorts of genre of music while in contrast, Julia wanted to focus on another. So in result, they are not singing together anymore and Julia left the band.
It says on internet websites including Wikipedia and IMDP that Eric Roberts and Julia Roberts are related, however I can't seem to find this true since Eric and Tanya Roberts resemble each other much more so.
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