Please no hate guys

So this guy just ended a very long term relationship with his ex. He cheated on her with me this night at a mutual friends birthday party. Right after he broke up with her we have been going out on dates. However, I’ve been noticing that he still wears his exe’s chain and he’s been following so many girls on Instagram. I mean if he wanted to be with me then why follow those girls? At the same time, I know that he left his girlfriend for me, so he must want me right? Also, I’m not following guys on my Instagram at all but he’s going wild following all these girls. Could this mean that he’s not taking me serious? Or that I’m just a rebound?