Anyone that has been cheated on before what we’re the signs?

Me and my husband will be married for 3 years tomorrow we have a two year old. I have noticed some stuff aren’t right. He has stopped touching me and greeting me when he gets home. He’s always on his phone and makes sure his phone is always down. He freaks out if I take his phone. He left to work earlier this morning. I confronted him on Saturday but he obviously denied it and I commanded him to hand me the phone and give me the PIN number I think he deletes everything but I saw how him and this girl call each other and i saw he had a missed called last Monday at 9pm and when I asked him about it he said it’s a client from his work. He rarely talks to me and we finally had sex last night but after sex he was so detached. I don’t know what to think anymore.