Why does my ex make it seem like he wants me but is with someone else?

He's with someone and apparently she's okay with him flirting and talking to me. I told him I'm okay with just being friends. I don't want flirting. The issue is he doesn't talk to me like I'm friends with benefits or a friend, he talks to me like he's full on in love with me. Everytime he messages me it's "I still love you, you're the best connection I've had, I want you around, etc" It's like even when I just accept the L and say "I'm glad we're friends" he doesn't acknowledge it, or when i say im glad you found someone to be with, im happy we could salvage this it's like I'm in some weird area. He won't even talk about her which is strange to me.

Why does my ex make it seem like he wants me but is with someone else?
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