cheating?

okay so..me and my bf have been in a relationship for over 2 months. so i dont know whats going on with him. we barely talk anymore..he lied to me about his work schedule. and i understand hes in college, he cant talk sometimes. but weird thing is..is that he told me we shouldn't flirt because he doesnt wanna get caught. im 15 and hes 18. my parents wont allow us to be together so weve been hiding this for as long as we can. but idk what to do. hes been lying and everything and i feel like hes cheating on me. just hearing he doesnt wanna flirt as much anymore puts me in a mood i dont wanna be in...AT ALL. its weird. but someone help me out here and please. idk what to do.