My SO has been hanging out with this girl coworker since Monday . She takes him to work for the afternoon shift then they hang out the couple of hours in between then go to the night shift then she drops him back off at home . Monday night we got into an argument cuz he had 4 hours in between the afternoon shift and the night shift and instead of him telling her to take him home he ran errands with her and out to eat because he wasn’t giving her gas money to take him to and from work so he had to “go with the flow” his words not hers. We txt a lil bit earlier after not speaking since I left Monday and he called me and told me what him n her been doing the past few days and how she been in his apartment and that right then she was walking her dogs and he was in the car waiting then he told me to go to his place so I’d be there when he got off cuz he misses me. The girl gets in the car and he’s like he got to go . Since he has a bad habit of putting his phone down and not hanging up I decided to stay on the phone n mute my side . So she get in the car and says you can be on the phone I’m not the type that gets mad their guest is always on the phone he’s like nah that was my girl she says some girls name and he laughs and says stop playing with me nah This one really make sure a brother straight i hung up then I go to his apt and my red silk shorts are on the side of the bed on the floor and my drawer of clothes has been gone through . So I call him 10 min before he has to go in and he says how the girl spent the night Tuesday morning after night shift and he told her to put on some of my clothes so I’m like u shared a bed with her and he’s like nah and before u ask no we didn’t fuck being the big baby I am I just started crying . And he apologized and told me he had to go in . So now idk what to do I’m sitting here sad and in my feelings . Does it sound like he could’ve done anything with her? His next off day not until Friday so he’ll have to be with her all of Thursday as well. Should I go through his phone ? I know if I have to ask myself that’s bad but idk😐

Update- I went through his phone so I could see if he been texting her flirting and stuff cuz there’s no way to tell what they’ve been actually doing in person. I call her and she’s like she didn’t wear any of my clothes he went through the drawer and picked something out for me handed me a T-shirt and shorts and she put them on the edge of the bed and went to sleep and said he slept on the couch. She says if it makes me feel any better then she’ll start taking him home after afternoon shift then get him for night shift....I’m like yea do that ...so today he’s about to go to afternoon shift at 5 he won’t let me see the girl in person, “cuz I’ve already talked to her otp” and we’ll see if she brings him back at 8 and get him back at 12