The jury did have very select information.
We, the general public also do not have a full picture.
IIRC, both JA's parents and former boyfriend DB said that she started to change about 2 years prior to her arrest/the spring of 2008. This was a good four to six months before she met Travis.
JA and Travis were an official couple for only 5 months and during this time, it was a long distance relationship. She moved to Mesa after they broke up in June 2007 and Travis was very upset with her plans to move. Friends related overhearing his phone conversation with her, trying to dissuade her from moving to Mesa because her only reason for doing so was to be closer to him.
We do not know how often they saw one another once she had moved closer to him, nor do we know whether she was wanted company or not.
I do view JA as having been obsessed with Travis. This, combined with her known propensity for lying, leads me to believe that the defense tried to paint their clandestine relationship as much closer than it was in reality. Was she the one who was constantly interjecting herself into TA's life?
According to the Hughes, Travis had seen his bishop sometime before his death for counseling regarding his breach of chastity. This leads me to believe that the sexual encounters were much less frequent than the DT would want people to think.