Am I being paranoid? Or I'm right?!?

I'm engaged with my bf of 2.5 years and moved to a different city because of his job a year ago. Since he works in the liquor business they have events or parties or trips from Wk where I'm the most of the time excluded. I have noticed different attitude about him more arrogant and keeps saying he works hard and that's why he does what he does like planning a trip without me and going out without me. I don't know anybody and he knows that. I have no friends and I'm a fun gal who likes going out but I get the feeling he is up to something bc we don't have sex like we used to and he says he's tired and also tired for going out with me but not for other ppl. He just came Hm from a strip club which I told him it was ok but he said he was coming back at midnight and it's 2:40am. Of course I didn't like that and when I asked why so late he got very mad saying he was having fun and that he was an adult and that he can get Hm whenever he wants too. I feel like he is disrespecting me after all I'm being through bc of him. I left my friends and family and a life I had for following him and for what? For this? This doesn't make me happy.

Question is do u think I am being over reacting or I'm right about how I feel?

I feel he might be cheating on me but I haven't seen any proof.

Thank you!