Matched on tinder, 3 dates and already made out with her since date 2, but still no sex.

I wanted to turn her into a plate or even potential ltr

Didn't see her in about 3 weeks, and suddenly posts a story with a guy with a "i love you" quote, si I guess new bf

The same day I texted her to ask her out and she agreed, didn't mention anything about a bf, but I'm expecting to her mentioning this on the date and maybe something along "let's keep being friends" or some bs

How would you handle this if you still want to get involved with her?

I'm already dating other girls but i really like this one, so I'm trying to save it.