Search Results: making first contact

So I’ve liked a guy at my work for a while now and I decided to text him last night even though we’ve never talked before. I just said hey. Well now the problem is that he hasn’t opened my message but some of my coworkers told me that he is always on his phone, so it means he definitely saw my text probably in his notifications and he didn’t open it. So I don’t know what to think now because I only texted him in the first place because I was getting a strong vibe that he was into me but maybe unsure/shy about making the first move so I did it for him. I thought he was into me because I kept noticing him glancing over at me repeatedly, I’ve caught him staring at me and he awkwardly looks away, my friends have told me he turns and looks specifically at me and also that one time he was staring at me for almost a whole minute and I didn’t notice because I was busy with something else. He also tries to get my attention frequently, like he will talk really loudly, walk in front of me a lot, and just try to bring attention to himself. There’s also been times that he has made eye contact with me and smiled while holding the eye contact for 2-3 seconds. We also always seem to catch each other’s eye eye from a distance. His closest friend at work has also approached me multiple times to try to talk to me and be friendly with me/tease me. So I don’t think I’m wrong in assuming he’s interested but I don’t get why he hasn’t texted back or even opened my message yet? But what do you guys think?