Yeah, its suspicious. Any time somebody is hiding something from you, it’s because they don’t want you to know about it. Of course, a guy is going to tell you he hid it because its no big deal and he didn’t want it to cause an unnecessary argument, but…if it’s not big deal, why hide it anyway?
See what I did there?
If the coworker knows you exist and is still texting and calling late then she’s just disrespectful and you have the right to tell your man to tell her to cut it off. But you need to realize that he hasn’t done so and is basically encouraging it by accepting and responding to her text messages. So two people are being disrespectful, him and her. You should let hi know that you aren’t feeling it and he needs to let that chick know to cut it out. If he tries to tell you that it’s nothing, then he’s very selfish and inconsiderate of your feelings and probably long donging her. Sad but true. He’s already hiding her contact info.
Point is, you should be suspicious but instead you should make him put up or shut up. Either cut that stuff out or get to steppin’.