My (19MtF) talking stage (19M) told me he started talking to his friend again who he had sex with once. Idk how I feel.

r/

Recently, I met a guy and we’ve been talking. For context, our first hangout was a hookup, where we just talked, teased around, and didn’t have s3x. I mentioned I did FWBs and asked him if he wanted to stay friends, he agreed and we continued talking. We talked about his history with guys, since as a trans girl I like to know out of curiosity. That’s where he mentioned a coworker, who he had been friends with since high school, and how he had sex with him after work when they got in the moment. I’m very cool when it comes to this, so I played it off and mentioned having a threesome with him. It didn’t really appeal to him, since he expressed regret and mentioned how he was upset on how that changed his friendship with him since after that they stopped talking. Fast forward to our latest hangout, he told me he didn’t want to do FWB and wanted things “exclusive” to us. I really liked him and how he treated me as a trans girl so I agreed. Now for more context, I’m Latina, the reason I didn’t do exclusive was because I focus on one person only and get jealous and toxic. So while we have been talking he mentioned how the guy talked to him again because he was going back to his home country and his work group (friends) were planning going on a trip before he left. This is where I’m confused. He told me his relationship with him is purely platonic and he doesn’t do relationship with guys. And He has also told me he is mostly straight so I don’t want to be jealous. He has assured me that if I don’t want him talking to his ex best friend that he could stay away from him. I’m so tired of being toxic though , but I’m scared he’ll talk to him secretly if I tell him not to talk to him too. I really like him and I really want to do things right. Should I let them stay friends? I plan on meeting his family for our next hangout so he also really likes me and I believe he also wants to try things with me. He was the one who proposed just having things between us and has express several times that he really likes me. First time on Reddit so please be nice!

tl;dr : Should I let my talking stage talk to his guy friend he had sex with and regretted? I really like him and I think he likes me so I’m not sure what to do since I don’t want to be toxic.