Boyfriend is using me?

We been together for about 4 years good and bad we have a daughter and plan to build a house in México. We have been in Mexico for about 2 months. I came home to tx to file for the tax return and received it. Ever since I got it he’s been calling me only for money. He goes a week without calling, I would call and they will tell me he’s not here and days later he calls and asks for money. Recently I got tired of it and today there’s a party he calls me and tells me that he wants money for gas and other stuff knowing 4 days ago I sent him some. I called and we got in a fight because I said no, to find out he left to the party alone in our truck. He wants us to go back already but I’m not to sure about it. He says “if you’re not here by tomorrow we’re over and don’t talk to me” . That’s so childish. I’ve been calling and he doesn’t want to return my calls . He’s never been like this. Why do I feel like it’s wrong that he left to the party alone in our truck and he’s using me ?