Crazy Mixed Signals. Hurt and confused

So, my boyfriend and I broke up recently. Then, we decided to try and make things work. My birthday was recently and he bought me a birthday present. He had it sent in the mail to me with a very nice note and everything. We’ve been talking, he was texting me first every day and telling me he loves me. Things were almost back to normal.
And then today he stopped texting me for a while and I got upset. He basically told me he didn’t care to talk to me, which hurt me and we got into an argument. I was feeling hurt because someone who used to love speaking to me so much is so blatantly rude to me now. And then, when I confront him he says I’m being crazy and tells me it’s not going to work.
As you can see, I’m feeling very confused. I mean, I know what mixed signals mean but i just wanted this to work so badly. I am so confused as to how someone (who doesn’t even have that much money) would buy me a birthday present and then four days later tell me he’s “not feeling it anymore”. He sometimes says things just to upset me when he’s mad at me because we said hurtful things to each other but he’s basically told me he’s done and I don’t want to beg. Is there anything I can do to salvage this or is it a lost cause?