Boyfriend laughs at me when I cry

My boyfriend and I seem to be having some issues lately. The main one to me is his insensitivity. I feel like we have not enough communication and when I try and talk to him to fix things he pushes it off like my feelings don’t matter. He acts like I inconvenience him when I get upset, and he will laugh at me when I cry. When I ask him why he does this he says I shouldn’t cry so much. Even when I was crying trying to tell him how this was really hurting me he said the same crap and I didn’t even get to finish. But I feel like I’m holding all of this in and since he won’t even talk to me about anything, I get so frustrated and upset that I just cry. He makes me feel like I don’t matter to him, that I just burden him. And it’s so hard because I love him more than anything. After this last argument (me crying and him laughing at me), I told him I can’t deal with this anymore and don’t think I can be with him. Then all of a sudden he starts to care again. I don’t know if this is just some temporary bs to get me to stay. And I don’t know what I should do or how I can approach talking to him about this so that he really understands how badly this is affecting me.