Boyfriend 10 day trip

Hello everyone out there I thought this might be fun and up lifting. Well right now in my life I am kinda sad that my man is going home for about 10 days. I am gonna miss him but I am also kinda scared that he will cheat. I dont wanna think like that but I know his brother and his brother likes to drink and idk I just want him to come back still my man. I trust him I just dont know sometimes the thought just enters your head. If anything did happen it would be over forsure and he knows that I just dont want to be that jealous girl saying dont do anything.