Hm..well, I, like most everyone, believe that Lily loved James. Of course, who knows, she could've been forced into a relationship with him because it could've been necassary for something, and then grew to love him.
I agree with Remus and Sirius telling Harry the truth, but Remus and Sirius have absolutely no idea what's going on in Lily's head. Of course they wouldn't lie to Harry, but do you really think that they wanted to hurt Harry's feelings by telling him that his own mother didn't love his father (at first)?
Hehe, I'm just stating, not trying to make it sound as though I don't think Lily loved James. Then again, I'm one of the few (if any) who try to defend weird topics that hardly anyone seem to agree on.