Tim's default
Completely agree. Both times Tim had a choice between truly thinking about which girl he liked, he ran from the decison so ended up taking the easier path. Both times he had to choose between Steph and the other girl, he chose Steph, more by running from the decison than facing it. And this also explains why he was busy obsessing trying to clone Connor not Steph (Unless Steph had a no cloning clause in her will)