Is he going to sleep with her tonight? should i be worried?

I'm very stressed..i have been off and on with a guy for 2 1/2 years..I'm 28, he was my first so i'm very emotionally attached. He told me weeks ago a friend (girl) was coming to town and that she needed a place to stay while she visited all of her old friends here. He wanted to let me know in case I drove by and saw a car there all weekend. I'm really worried..I know it's wrong but we had constantly for abut 2years..we had alot of problems and quit talking several times..we stopped having for about 6 months..i know he's a guy and im worried his hormones will take the best of him..i know she will sleep in his bed (although he tells me not) i know this cuz he hasnt put his other bed up in his room. He swears he is not attracted to her. She is heavy and he says neither of them like each other just buddies.. I don't know why im having such a hard time trusting. He is supposed to eat lunch with my family tomorrow after church. He's never really hung out with my family so im nervous and should be excited but the whole time im going to be thinking and wondering about all the dirty things he did the night before while we are sitting at the table...im so upset..it's because i know we arent having , so how do i know this isnt a call and thats y she came to town?? of course, i randomly drove by tonight and saw her car which i know shes already here..he didnt tell me she was though..then i called to let him know we changed restaurants where we were going(after i drove by-acting nonchalant like i didnt know she was there) left a voicemail. he called back about 10 min. later and didnt mention anything at all saying she was there..he was acting funny i thought but at the end of the conversation told me to have a wonderful day and he will be there tomorrow..i felt he was acting weird or maybe it was just me..am i being too paranoid? im not gonna be able to sleep tonight