Jealous of connections partner is making in rehab?

I’m having a lot of challenging emotions around this. This is the second time my partner relapsed and hid it from me. This time he went to a rehab center and has been there for about a month and a half. He has talked about people he has been building friendships with and I know it’s women and men there. I can’t help but feel jealous and resentful that he is opening up and being vulnerable with essentially strangers, but I haven’t received that part of him for so long. So these strangers in rehab get to experience emotional intimacy with you, but you haven’t shared that with me for a long time? Also I can’t help but wonder what kind of connections he’s making with girls there and how unfair it feels to think random girls get to see sides of him that I haven’t. I know all my feelings are valid but need help understanding how to navigate them. It’s just been a really hard experience to feel like I get the version of him that lied and hid things from me and these people get the healing version of him where he is open and truthful. And that while I’m at home hurting and trying to heal by myself, he’s there with all this support and making all these friends. Has anyone else felt like this?

Also the status of our relationship is unclear right now as I’ve said I don’t know if I want to stay with him. He is very understanding and apologetic and knows I have every right to be angry. Our plan is for him to go to a sober house when he leaves there so I can have more space at home. He is genuinely a good guy, but has a lot of emotional work to do on himself, and addiction has gotten the best of him. I know I absolutely deserve better and more, but have hope that he can change too if he actually seriously commits to the work.