I have a suspicion that how interested he gets in the beginning depends on your stats, too.
In both playthroughs I had high compassion and candor, and in a 1st one I chose to stay and talk to him before the event started, and got a comment about how he seemed to have passed some king of judgement on me. I could still can approach him on my 2nd and go to his place after giving the check (and choosing 1st friendly approach, then flirty), but it was entirely my initiative.
Robyn, on the other hand (during the 2nd run with the same stats), seemed interested from the very start, even suggested that we should talk. At a guess, a character with different personality would have received a different treatment. She also showed interest later on, in the same playthrough where I slept with Aaron twice)))
Brett is probably the most straightforward one, so long as you show interest at key points and don’t screw things up deliberately.
So, comparing Aaron with these 2, I conclude that this guy is more trouble than he is worth 
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