Am I overreacting?

I was on my fiancé phone trying to call my phone because I couldn’t find it. I went to his history calls because we recently was on the phone & I seen there’s been this number he kept calling & the number kept calling back for a few days now..

So I asked him since it was from another place & he said it was a guy friend of his from work.. I’m like oh okay. Then I remembered my fiancé sent me a screenshot of his work schedule (showing me how they constantly write his name wrong etc). I seen how the number was on there & I got curious & texted it since something didn’t feel right .. I texted the number & turns out it’s a female🙂I asked myself why would he lie? So I asked him if he was sure it was his male friend he called Patt & he said Yes.. he promised.. then I told him how I knew it was a girl name Paris & he froze .. he said he got the numbers mixed up since they have “similar numbers “.. am I wrong for feeling a way.?? It doesn’t make sense .. he keeps saying “oh I only call her for work “ but i don’t believe it ..

HE SAYING SHE AINT SHOW UP FOR WORK SO HE CALLED HER😭😂I asked him “oh that’s your job now.? She don’t show up & you call her.? Your boss can’t do that.?” He said his boss asked him to call her since she had swollen eyes or something & I told him they are they BOSS for a reason. So THEY can call. I told him I’m not falling for it