Is my ex using me for an ego boost? What's going on through his mind?

Anonymous
Please read this all if you can (:
So me and my ex had no contact for about 1 month. One night at like 4 in the morning he texts me, saying hey. I didn’t respond until the next day. I was really surprised that he texted me, because back when we broke up, he said how he hated me, and never wanted to talk ever again. We initiated contact back and forth, he asked how I was doing, etc. He than began flirting with me a week after that, he even talked sexually. Than he’s telling me he’s not looking for a relationship from anyone, and he only wants to be just friends. He is one of those party boys that takes drugs, etc. To me he is a loser. He’s usually the one to contact me first, just saying hey and we text for a bit. But one day I got a message of him saying he’s in the mood. Why would he say this if were only friends? I haven’t seen him in person for about 2 months. He texts me saying sexual things, and that he wants to see me tonight. I didn’t see him but the next day I check his twitter, and he tweeted that he liked someone and that he’s scared to like someone again. I asked him about it, and he said that he liked this other girl. When just last night he was calling me baby and saying sexual things. What should I do?
Is my ex using me for an ego boost? What's going on through his mind?
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