Am I overreacting? Boyfriend talks to coworker A LOT

Savannah

Okay so I used to work at this Italian market, and it’s a small business so theirs only liek 7-10 people total that work there, so you get comfortable pretty fast. It’s also 8 hour shifts everyday and is about 4-5 days a week. Anyways, I got my boyfriend a job there a few months after I started working there. Prior to working there, there’s this girl, we’ll call her Jen, she’s about 24 and has a boyfriend, but they are Long distance. Me and jen were friends and would talk but she never told me anything about her not liking her boyfriend or anything. after my boyfriend started working there I had to leave because I was moving further away, and my boyfriend continued to work there. He ends up getting super close with Jen, talking about her all the time and talking to her all day and even planning their breaks to be at the same time. Jen would sometimes work in the bakery and he would go and sit and visit her on his 10s, like?? The Jen starts telling him how she doesn’t like her boyfriend and all this stuff and they start texting and they even went after work to get ice cream, listened to music, played chess and talked for 3 hours straight jsut liek having a deep conversation, and still feel the need to text?? I’ve voiced my opinion how I feel and he just says “we’re friends I’m not like that” but then also proceeds to tell me he likes when girls like him and literally siad one time “I wonder if her boyfriends knows about me, cuz if he does if I were him I’d be so upset.” Like what?? And we’ve had so many arguments over it and he jsut says “I just really enjoy talking to her” like bro I feel like I’m going crazy what do I do??? He wouldn’t cheat but this is just making me sooooo mad…….