I love my boyfriend but our realationship is really hard on me, should we break up?

My boyfriend has lied to me and done some awful things to me but I still love him with all my heart, we've been togeather for 4 years and I've been really depressed lately but he hasn't noticed. And I've always pictured my life with him and I don't know how I would go on without him. He's gotten rude and kind of mean but when we are alone he is so good. I feel really bad and I don't want to feel that way anymore but I can't get myself to break up with him. We are 19 years old.
He is my best friend and we have the same group of friends, my closest girlfriends all look at him as his best friend. He can be such a great guy when he wants too.

Tell him how you are feeling and if the relationship stays unhealthy then you should break it off because that isn't good for your well being. I hope everything turns out ok! :)