I totally agree, except I think that Travis DID care for her in the beginning of their relationship. He did many nice things for her and if he was just using her for sex, I don't think he would have been as caring. I think down the road into their relationship he realize that she was not marriage material, but she was crazy and a bit of a stalker, too and his feelings about her really changed. However, he was not able to turn off his sexual feelings toward her so he kept sleeping with her. It does appear that at a time they were both sexually obsessed with one another. I think in the end he was really trying hard to let go and get away from her, but before that process could be complete - she murdered him.
There has not been one shred of believable evidence that Travis was ever physically abusive to her. Not one. We only have her word. Yeah, sure...he did not speak to her kindly and was down right mean to her at times...but this was no excuse for her to feel threatened physically. I bet she said some unkind things to him as well, but funny - she never taped those conversations. I think she killed him in a premeditated jealous rage because she realized he was letting go of her. The upcoming trip to Cancun with another woman put her over the edge.
Also, she can say he was a nice guy all she wants, but not once has she seemed remorseful for killing him. Her testimony did not ring true to me for many reasons, but one that stands out is this - I feel like a real victim of violent abuse would be saying something like "I'm sorry I killed him, but I was in fear for my life!" I don't believe we have ever heard her say she was sorry or that she was remorseful for his murder. Instead she is up on that stand day in and day out speaking out both sides of her mouth - trashing him mostly. I chose not to believe her. Nothing about her or what she says rings true.