My husband slept in the hotel and I found out that he talked to his exwife at 1am. Did he sleep with her?

My husband and I got into a bad argument after we drop off her daughter to his ex wife,s apartment. He always argues with me after we drop her off. I told him I'm tired of you arguing with me after we drop off your daughter!. It never fails. I try to be nice to her daughter but my husband always wants to be defensive over her daughter and it makes feel irritated that our marriage is been destroyed over a 12 year girl. We got home and argue more so he end up leaving the house around 1030pm and I called him around 1130pm because he never said where he was going. He didn't pick up the phone, I called again around 1200am midnight didn't pick up and my last call was at 1230am midnightand I told him: if you don't came home to sleep and you don't call me back then we are done because I won't be able to trust you. My husband never called me back, instead I found out the next day that he called his ex-wife couple of times and talk to her for 1 or 4 minutes. Then, his ex-wife called him around 1am and they talked for 10 min.Do you think they met up? My husband spend the night at the hotel. It's hard to believe that they din't meet up. Why didn't he went to his family instead to spend the night? My husband came home around 1130am the next day, and ask him where he's been? he said he spend the night at the hotel. So I told him, I'm done with this relationship, you knew that if you didn't came home to sleep this marriage was going to be over and you still did it. I told him to pick his stuff and leave the apt. He seem so tired, like he didn't get no sleep at all. He went and took a shower instead and told me that he doesn't want to leave that he wants to work things out. I feel so played by him because I just find out this morning about the calls he made to his ex-wife and I'm back with him, we even went to eat lunch, watch a movie and made love. How sick!!!! What if he had with his ex-wife? I would never know. His explanation for the late called was that he was talking to his daughter about plans. I don't believe that! I'm lost I feel like the marriage is over. One more thing I want to add, We just move in to his hometown where he met his ex-wife and where his parents live. He grew up here in this city. I feel like I'm an extra piece in the puzzle. I feel unloved. I feel that my husband's priorities are his daughter not the marriage.