Husband cheated with my best friend, but he's also the victim of the whirlwind?

**tl;dr: Friend's sister and hubby were fucking. She died, hubby and friend hooked up, friend said she was breaking up with bf, hubby and friend kept fucking, friend didn't break up w/ bf, told hubby to kill himself. He didn't. I was told. I want divorce. He thinks we can work this out.**<br><br>---<br><br>I've been married for 5 years, together 7. I have a little baby that is 2 years old, you'll see pictures of him around the house. We have a 2 story home, with an uncompleted basement that he sometimes sleeps in. <br><br>I have a best friend, let's call her Annie, who's boyfriend (let's call him Jamie) recently died in a motorcycle accident. Annie was also friends with my husband. <br><br>Annie and Jamie's sister, Leah, was also friends with us. She died two months ago in a car accident. Annie was devastated. I found out later that Leah and my husband were having an affair, as Jamie had previously suspected. Jamie had even moved out for about a week, but then came back.<br><br>After Leah's death, Annie was distraught. She would come over and hang out, sleep on my couch, etc. and her and my husband (let's call him Jim) got closer. Annie started coming over to our house without me, and would go hang out with my husband. My husband would invite her. Sometimes I would come home and find Annie bumper-to-bumper with my husband but they'd stop as soon as I walked in the room. <br><br>As we got closer and closer to Leah's death, Annie started healing. Jim confided in me that he was into Annie, and asked if it would be okay if he asked her out. I said no, it was weird. Annie was into him, and she showed him her cleavage and would sit on his lap, but I never thought it would go anywhere. <br><br>Annie and Jamie had a fight and he moved out about 3 weeks ago. She went back to her parents. She said she was going to break up with him and come back to our state. I thought maybe she'd come back but wouldn't really break up with him. Annie and Jamie were together for 15 years, so I figured they were too intimate to break up over a little fight.<br><br>But Annie said she was done. She was tired of Jamie's reluctance to commit and tired of him not listening to her. She was going to "forge her own path." She was moving to an apartment near us. I told my husband he could ask her out if he wanted. The first night she moved in, she came over and watched a movie with us. She flirted with Jim, and even tried to flirt with me. She kissed me, but I didn't kiss her back. I was a little annoyed he didn't do anything. He knew she had been flirting with him for months. I was a little annoyed nothing had happened. She flirted with him again the next day, and he did nothing. I told him he should make a move or she'd lose interest. He said he was waiting for her to be ready, but she was already making moves toward him.<br><br>Annie came over one more time to hang out, and she and Jim went for a little walk with the dog. I did not go. I have a cold and have been sleeping a lot. They were gone for about an hour. When they got back, Annie made some excuse about going home.<br><br>I went to bed, and I could smell Annie's perfume on my husband. I asked what they did on their walk, and he said he tried to kiss her but she said no and then she cried.<br><br>I didn't believe him. I knew Annie wanted him, and she had been flirting with him for months. If he tried to kiss her and she said no, she would have told me. I asked him if they'd been fucking and he said yes. They fucked in my house. They fucked in my bed. They fucked everywhere. <br><br>He said she came over and fucked him when I was at work. He said she fucked him while Annie was still with Jamie, and that Annie was using Jamie for money. He said Annie tried to come over and fuck him while I was in the room, but he said no. He said she had him come over while I was sleeping, which is why she'd been trying to tire me out. He said she came over and scoped out our house to see the best places they could fuck without me finding out. He said Annie had offered to make a sextape with him but he was too shy. <br><br>He said he was sorry. I said this was messed up. He said Annie was manipulative and clingy. He said Annie had texted him to kill himself. I said Annie was barely handling Jamie's death and that she was traumatized. He said she was no longer traumatized. <br><br>Now we're in a situation where I want to divorce my husband and he wants to work through this. He says he's still in love with me and he wants to be with me. I want to leave him. <br><br>I don't know what to do.