Suspicious?

The other day I was looking for a contact in my name's phone and I came across something weird.(also before I get told I shouldn't be in his phone, he knew I was doing it because I asked first)

I noticed two new contacts by the names of Zach and Marco. I thought this was weird because we don't have any friends with those names and we work together do I would know if it was a new coworker. In fact, the only people we know with those names that I can think of is an old co-worker that we both couldn't stand because he was rude to customers constantly and his little sisters old class mate. Both weird people to have as a contact so I screenshot it and sent it to myself.

I decided not to do anything else with it though because I trust him and let it be. After a couple days, it was driving me insane so I look the numbers up and one is for a Jasmine that lives about 30 minutes away. The second one is a person named Kimberly that lives about an hour away. The thing is, is that she's 59 according to the find someone profile and we're in our 20s so it seems weird that he would cheat on me with someone that much older?

I honestly just don't know what to think. I tried to casually bring it up and got no answers. Do you think he's cheating? I will bring it up if other people think it's weird but I don't want to upset him and I've never had trouble trusting him before so I don't want to cause problems if I'm just being crazy 😅

Thank you in advance for your advice! I really appreciate it😊