my bf is acting weird

I feel so unwanted by my boyfriend. He barely compliments me and I feel so alone sometime dating him. Today we went to the mall with his cousin and I got so sad. He always on Snapchat and acting so secretive that it makes me think that he's cheating on me. I have the guts telling me he's doing something to me and when I ask him something he's always making me seem like I'm acting like a crazy girlfriend. I feel so frustrated.