Why does my ex keep using me for support after all I sacrificed?

I thought my ex man left the woman that he got pregnant on me, alone. Turns out, she's online saying he came by her house to see their kid. I'm so mad. I told him not to talk to her anymore.. he drove to her. Smh in my car. AGAIN! And no, we're not together. Im the an old girlfriend. He has a new girlfriend. I'm just the one who helps him with his house, bills etc. And yes, he didn't help me with my house. I lost mine 4 months ago.. Why does he keep on playing with me? I sold my house, my car just so he could keep his house. This is thanks I get...

Why does my ex keep using me for support after all I sacrificed?
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