Please help...

What should I do. Here's the situation me and my boyfriend have been together for over a year he is the love of my life and he means everything to me I have a 4 year old as well which he is very involved here's the situation were moving in together tommorow he's what happened last night... Me and him usually don't text much either keep that in mind... He work the am shift he is a bartender and he worked from 10- ( he says he didn't get off till 5:30) which is unusual he sent me several text messages saying he loves me and missed me and to come over tonight which he usually does not do either then about a hour almost 2 hours later I call and he tells me he is just now getting on Alcoa hwy ( which is only 10 mins from his work). I ask you left work almost 2 hours ago he begains to tell me he stopped to pick up bud ( which is weed and weed is not bad people) and he pickes up with a girl he works with which is okay but 2 hours seems like a little long so that night I let it go because I thought I was being over the top because I know he loves me and everything but I looked at his phone no texts no calls how did she know he was coming so I ask him and he tells me that he deleted the text messages so I wouldn't flip out.. So that made it look 100 x's worse what would you ladies do I will not leave him but I don't want him to think that's ok and at the same time I don't want to be overreacting either help advise he's mad at me for not trusting him so I feel like he is trying to turn it on me... Help help help.