I genuinely feel so bad for Julian.
He literally doesn’t have any friends in Central City from what has been shown to us. He was always at the station before Caitlin asked him to join Team Flash. Once he joined the team, he was always either at the station or at S.T.A.R. Labs. Even in tonight’s episode (3x15), Julian goes straight from the airport to S.T.A.R. Labs. I don’t know about you but after going on any flight (especially one from Europe to America??) there’s nothing more I want to do than to go home.
Along with that, back in episode 3x05 (I’m pretty sure this happened in ‘Monster’ at least, feel free to correct me if I’m wrong), he claimed that he had a “girlfriend” but whatever happened to her? I feel like he said that to not only get Barry off his back, but to also make it so that his excuse made him seem less hermit-like. Maybe if he made up this fake person, then maybe he wouldn’t seem so lonely.
I think that the reason Julian latched onto Caitlin so much at this point in the season was because she was the only one to really reach out to him in an effort to become friends with him. Regardless of what Cisco and Caitlin said in the season premiere, that Julian was a “great guy”, nobody had really bothered to reach out to befriend Julian. So when Caitlin asked him to join Team Flash, not only was it an opportunity to have access to the greatest scientific technology, to make a difference in Central City, or to better understand his profession as a meta-human expert, but it was also an opportunity to be part of something. An opportunity to be part of a team.
So, when it was revealed in tonight’s episode that one of his only friends, if not his best friend, had only invited him onto the team for his profession, not for who he truly was, it must’ve stung deep. To think that someone you considered to be a good friend lie to you to get what they want is just awful.
On another tangent, Barry continued to use Julian as a “human Ouija”. Julian has stated time and time again how awful it felt to be vulnerable to Savitar’s control and how he was not comfortable with it, but Barry continued to pressure him into it multiple times during the episode.
I think that Julian was really starting to consider Team Flash to be good friends of his, and in just one episode, I think that they really tore that away from him. And for that, I feel pretty bad for the guy.