Boyfriend problems

Okay me and my boyfriend have been together for 2 years I’m 18 he’s 20, this summer has been strange. He’s wanted to hang out less with me and more with his friends which has been really frustrating because all of a sudden everything is changing in our relationship. For example there’s a concert that we are both going to but he wants to go with his friends which is fine but he doesn’t really want me to even go to the concert and when I bring it up he’s like you can come with me I guess but it’s obvious he doesn’t want me to. I’m stuck because I don’t know if he wants me anymore or he’s just with me because he doesn’t want to think of me with other guys at these events. Help please I’m so lost and honestly hurt! I need all the advice I can get