Beginning of relationship advice

Hello everyone,Met this guy a couple of weeks ago and we really hit it off. We both liked each other, in the first week we saw each other like 4/7 days and everything seemed to go really really well. Then he went on holiday for a few days and on the day he came back one of my friends texted me "did you know your boyfriend is on gridr online?". I confronted him that night and he said it wasn't him and that someone was using his picture. And as that is something that I've seen happen on grindr I have decided to let it go. Especially since he showed me that he didn't have any dating apps on his phone anymore.But after that night I feel like he became cold. He used to make me loads of compliments, now he doesn't, when we see each other he gives me a kiss or two, nothing more. Something seems off. But I don't know if I should put it on the fact that he is working long hours (11am-1am / 1pm - 3am) and we've only seen each other after his shifts cause I work during the day.Am I expecting too much of him after two weeks? Personally, I have made everything that is possible on my behalf to see him and spend time with him because I really like him and I'm also serious about our relationshipThanks! :)