Need your opinions

Soo... I’ve been dating this guy for nearly 6 weeks and we’ve been on lots of dates and stuff. We both like each other a lot and he’s always sending me cute texts saying he’s happy and can’t wait to see where we end up. Buttt we were out with him mum the other day and I had no internet so I was looking at his insta with him and he went off the app and he has tinder. I didn’t say anything because I didn’t want to seem like a psycho😂 I just get it, he’s telling me how much he likes me and all this but sill has tinder and follows girls on Instagram. Dunno if that just what guys are like or whatever but it’s really bothering me. I’m scared to say anything to him about it incase he’s like we haven’t been dating long. He was talking to me about how loyalty and trust is important because he never had it with his ex but he’s doing this??

Edit- he’s 18 and I’m nearly 17