Should I ask her if she still likes me?

Anonymous
i was hooking up with this girl for like a month, I'm 18 she's 16. she once texted me asking if I love her, and if I'm obsessed with her. so I told her I do have some feelings for her and that seemed to really excite her because the day after that we had sex.

recently she started talking to her ex, and last time I saw her she was sitting on his lap. now..for my own personal reference I wanna know if she ever liked me. should I ask her?
Should I ask her if she still likes me?
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