No, Obi-Wan didn't give him enough "attaboys" and so he turned to Palps to be his emotional mentor. I'm not horribly enthusiastic about Obi-Wan in AoTC (and definitely not fond of Anakin in that movie, either) - he was definitely more in the "master" role (for a reason) than "friendly mentor" role. Yes, he used a fair number of "my young" and "my very young padawan" to a 19 year old chafing at the bit to get on with his perceived earned rank of knight (because of his "power") - and yes, there were a surprising number of folks who thought Obi-Wan had no right to dress Anakin down before Padme when the boy was clearly "not defying Obi-Wan, but trying to impress a girl." In fact, someone started a thread that asked if Obi-Wan "disrespected Anakin" in that scene (yes, Anakinfan not saying there wasn't a better way for both to handle it) . I really really wish we had been given more of an insight into the years between TPM and AoTC - did Obi-Wan waffle between too strict and too lenient while trying to find the proper teaching style? Did he get any support from creche masters and/or the Council? Did things start out fairly well until Palps got his hooks into Anakin and got him questioning Anakin and the Order? And edited to add: and there it is again. Obi-Wan's mistake (and the Order by implication) was not being enough like Qui-Gon, especially when it came to Anakin. How - how dare they!