I think his cheating... TMI please help

Some girl texted my husband the other day and I found the text accidentally he said that she is working with him and she asked him abt somthing religious cause she lost somone close to her bla bla bla ...

I told him why he kept deleting the conversation he said cause he knew I would understand it wrong if I find out that his texting a girl.. well we have been married for a year no kids and my husband is very lovable he spends all the time with me we are friends and lovers and we love spending time together and he is never late coming back from work ... I use to trust him.. he even told her that his married and wth happend to u happend also to my wife.. yesterday he was up till 6 am in the living room on watssup I didn't say anything to him when i asked him in the morning he said he was texting his best friend in the uk.. before he left to work he came and gave me a hug and he said that he loves me too much and he would never think of cheating on me cause he noticed how upset I was but I just can't believe him please advice me .. you think his cheating! !!