Advice on my relationship?

Hi guys. I know I'm going to sound young but I started dating this boy my freshman year of highschool when I was 14. Fast forward I'm now 17 still in that relationship. I know that relationships hold bumps and turns and we have to communicate and get through it from what I see, and it works! But that's not my main issue right now. In the middle of the relationship he started going off and doing what he wants. He lies about his location and what he's doing. Everytime I feel sadly impacted about a situation and I bring it up to him he reacts if I did something wrong. He calls me childish, he tells me to grow up and act my age. I love him very much and I can't let go off him no matter what. Sometimes i think the good over weighs the bad, and it does! But the bad things he does really does hurt me:( I just don't know what to do. He was there for me throughout almost everything, he's my best friend & lover! But the things he does. Lies about what he's doin or his whereabouts or when we argue he bashes me and constantly tells me to grow up and stop being so sensitive, those things hurt a lot! I just love him too much to let him go, and most nights I end up crying alone with no one to talk too. I just really need help I don't want to let go of this 3 year relationship but at the same time I want to stop being so sad.

Thank you for reading<3