What would you do if ,,,

It's gonna be long but here it is 

My husband has a female coworker that he is really involved in with. He's her boss and they are at all times in same group. 

I knew her from previous job and know that they were working together in this job. 

He's 24. Shes over 40. Yes she's cute and all she has kids n engaged. 

We went out as a double date or whatever and I felt comfortable because she actually had boundaries and that she made sure I didn't feel weird that they were working together. And her man told my hubby thanks for looking after her at job site since she's the only girl in the entire groups. 

Few months went on and on his birthday I threw a get together type of party for him but instead of enjoying it at the second location we went hubby decided to tell everyone that he was cheating on me w her. 

She got so mad and she held me saying sorry that he's acting like that and that I don't deserve this n she went on to get her man as he was ready to kill my hubby. So long story short hubby blamed it all on alcohol n said that he didn't mean anything and nothing happened between him n her. 

I left for my mothers house the next day not really caring if it was alcohol or the truth just needed time for myself. 

After 4-5 weeks I came back and we worked things out because I believe that he hasn't done (sex) anything yet. I know my husband after all these years together I know when he lies and I'm on top of everything like his money email text or whatever you name it I have it. But I know I know that he has feelings for her. It's just matter of time. 

On top of that stress I had miscarriage few weeks ago and he wouldn't take a few hours off of work to go ultrasound w me. I went all of them even the last one by myself. 

Now why I'm here is because today he got his pay check but he found it less so he told me to check and calculated his hours but I think he forgot/slipped that he left early last week to get her son PS3 game system.... I knew that he was helping her get it since she has no idea about these things but I never knew that he left early to go pick it up for her. 

Now I'm speechless. Only if you guys knew how much he hates leaving early or taking a day off work since day 1. He never I mean not once left early for so many occasions he should have. But for her buying damn game system he did. 

I know it's such a small thing to get mad about but it's just little things like this over and over again everyday. And I'm tired. 

They go to lunch together 

They won't stop texting after work N like I say they work together like assigned as a group. 

Yes I have talked to him about it yes I told everything above to him. 

He calmly says he deserves it since what he did to me on his birthday and he will let me go thru process of trusting him again and will take emotional "accusing " too. Also said he gonna prove he loves me and regrets what he's been doing. So just day by day I guess but today about the leaving early thing for her is setting something inside of me that I can't just control anymore. 

I know it's a lot. Thanks for reading. I wish I can put more details but I'm done as I feel like I just lost pounds off of my shoulders just for being here talking.