My husband's ex-wife raped him updated

That was the hardest thing I've ever had to admit before, I can handle the things I've been through but sitting here watching him fall apart knowing he will have to see her again in a few weeks is painful. Let me explain and maybe y'all can help me help him cope.....

Trigger warning

Trigger warning

So Tuesday evening my husband got a call from his ex-wife saying that her current mother in law was sick and couldn't pick up their oldest from an after school thing and no one else could either. She asked him if he could so he agreed. He was in a hurry cus my step son had already been waiting for an adult for an half hour at this point. My husband went and picked my step son up and dropped him off, he had to park in their driveway and basically no one (adult wise) was there but his ex-wife. We've never liked this before cus she's been known to try to touch in the past. She wanted to talk. Sat in our truck cus my other step son came out for hugs... Bitch dropped her shorts and underwear and then yanked my husband's shorts and boxers down... He went to grab his phone in a panic from the truck and she pulled him into her. He quickly yanked away... She fell out of the truck and he jumped in and drove off... He called me almost in tears... He felt like shit because previous abuse has made it where if any part of his mind senses he's about to be raped he gets hard. She was beyond wet (I saw his boxers after and my goodness she was definitely prepared) we always knew that she might try this especially now her and her current man are having problems but now he feels worthless and lost. He chose not to report in fear of loosing his boys... I washed his clothes tonight while he slept so the reminder isn't there come morning but I'm lost on what else to do. Tonight he seems to be sleeping well but I know it's coming... He's been raped in the past and those nightmares still haunt him. What do I do?? How can I help him through this??

Please don't comment that men can't be raped or that he's lying and cheating this man is beyond faithful and men can be raped plain and simple.

Update: as much as u wish I could do pick up and drop offs im not currently able to drive, we are trying to figure out a way to have someone go with him because we recently had to downgrade to a truck after our van was totalled (I used to always go with because of her trying to touch him and make advances in the past) neither of us thought she would ever go to this point though.

His fear of loosing his boys comes from her having primary custody and the fact she's already tampered with her copy of the custody agreement and made it look like he should have supervised visitation only (before when we had the documents I looked them over and it said nothing of this but we currently don't have a copy and my husband doesn't remember ever signing the documents during their divorce. The paper work said he did not attend the finiaztion yet he went to every court date he was made aware of)

She did not know about the previous abuse other then the things she did to him while they were married. They were married young and he still believed what he was taught at the time that men can't be raped plus honestly he never was comfortable enough to tell his ex-wife that his stepsister was a rapist.... Yet alone the whole story. I'm looking into therapy for him and so far he's doing ok or as ok as he can be. He made a huge step by not just telling me but my mom (a sexual assult survivor) and his Uncle, we called the rape crisis line the day it happened but he could barely talk. At this point it's trying to help him avoid this happening again. The ex-wife called yesterday less then 24 hours after she did this and she almost sounded depressed. I can't feel sorry for her though, I don't care if you aren't getting any from your man that doesn't mean to rape your ex-husband.

Sorry everyone it's been an emotional 72 hours.