Am I overreacting?

My husband and I split up right before thanksgiving 2016- got divorced the whole shabang. Then we realized we still loved each other after a year apart and wanted to get back together. When this aha! moment happened I had just said yes to dating this guy my family had been pushing me to date for that whole year- and he had just said yes to this chick who had been begging him to date her for that year. my guy took it well, seeing as we hadnt even kissed yet or nothing, said goodbye and we havent spoken since. that chick, however, had literally just moved all her things into my husbands place and her roommates had already rented out her room. so she stayed with him for a week trying to find a new place. during this time she did the following things- 1. when he told her he wanted back with me she punched him and grabbed a gun threatening to kill herself (even though she has a 3yo). 2. tried to get him to take shots with her anytime I wasnt around (which fortunately was only 1 night of that week) 3. tried to tell him that he had sex with her that one night I was gone even though he was on the phone with me until he passed out with only a few hours left to get up for work. threw us both for a loop when she did that.

she had begged me at the beginning when she realized he was serious to let them stay friends and at that time I told her it wasn't my choice but his- as long as she stayed respectful and she said she would. not even 1 month later I find texts on his phone from her talking about how her new boyfriend doesnt spoil her like he did-isnt good at sex like he was-ect. so I messaged her on his phone and told her that was NOT respecting me and if she didnt stop messaging him like that I would have to cut her out of our life. she responded by cussing at me and telling me to stop checking his phone. so I told him to handle it... his way of handling it was to just brush her off when she started texting him like that instead of telling her to stop. then he started hiding the fact that she was even massaging him bc he said he knew how upset I would get. but he got drunk one night and forgot to delete her text- about 3 months after we got back together- and I told him I blocked her on all his social media and if she found a way around it and he answered her back instead of blocking her again I would consider it cheating and leave. I was already pregnant at this time. she texted him asking if it was me who blocked her and he responded by telling her they couldnt be friends and to stop messaging him bc she was causing issues. then he showed me the message and blocked her #.

I was happy- I felt like he took a huge step towards us making this work and me trusting him. we havent fought over anything since. it will have been a year we have been back together this October and tonight his phone went off a 2am- so I got up to turn down the notification since I already cant sleep due to baby-and I saw "thanks rayni" on his fb messenger chats. thats her. she made a new account on fb messenger to get around the blocking. she wished him a happy fathers day. but Idk if that was all bc he could have been deleting her messages again this whole time. and ive been a fool. I am having a panic attack. Idk what to do and none of my family or friends are awake. what if he's been talking to her this whole time? he works long hours on a job where he has to drive all over Houston- I dont ask where he goes when he isnt home bc I trust him. now my mind is just all over the place. am I overreacting?