Questions: Guy's Behavior

He was interviewing my alongside the 2 senior managers of the team and was supposed to mentor me and show me around on my first day at work since I was assigned to his project. I felt like I sucked during the interview since the senior manager seemed to not like me but received an offer the next day. I assume it was because I was the only applicant for the role.

When I arrived on my first day I saw him making a phone call in the lobby but not acknowledging me. Later the senior manager welcomed me and showed me the office where he was not to be found even though he was supposed to show me around. Later I found out that his coworker would mentor me instead of him and he never made an effort to talk to me, not even work related issues. Even other coworkers mentioned that he barely spoke to me so I’m not imagining it.

Does that indicate that he thinks I’m incompetent and therefore doesn’t want to be associated with me? Or does he think I would just be a bother because I don’t come off intelligent enough for him? Or does he just find me unpleasant or physically unattractive? He is married but I know that he has an affair with his coworker and he is quite sociable so it’s not like he is afraid of metoo.