How to cut off attention whore

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How do I cut off an attention seeker?
Basically we talk and see each other, she calls and texts me then after 2-3 weeks she all of a sudden stops, then I'm the one chasing her while she doesn't respond to my texts, or cancels on hanging out at the last minute and after I realize I'm wasting my time I stop. Then there's a huge gap of about 3 months where we don't talk at all when one day we bump into each other and start talking again, and the cycle repeats.

I think when she finds someone "better" she ditches me and hangs me out to dry.

Anyways, I just left her alone, but she texted me the other day trying to initiate contact, but after I kept it short with the whole "I'm doing good, what about you?" she stopped responding and went away.

I've moved on but how do I respectfully cut all ties? as in I don't want any kind of contact and for her to stop coming back,
My roommates told me to stop ignoring people as a method, and I guess they're right, so that's why I'm here