Am I overreacting?

Do you ladies ever get the feeling that your s/o might be.. unfaithful to you? You trust them but you're just unsure.. He claims he'll never cheat and all. Keep in mind it's LDR, we have a 6 hour difference (he's ahead of me).

We had a fight today and even though we came to good terms I still wasn't feeling all great.. he said he was going to see his friend (male) who lives 20 mins away. He left at 12:30am and it's now 3:30am, he said he and his friend are smoking weed and talking but then I start getting bad vibes. I told him my concerns and he told me not to worry he's coming home soon (he told me that at 2:40am). I'm worried and I'm not prone to overreact.. this happened before but I never thought of it until now.

Am I overreacting?