Did he tell her about that or was that coincidence?

Hello guys. So here's the deal I have feelings for a guy and another woman too (even though she has a boyfriend) Last time when I came to see him and after leaving this one crazy chick was following me around and laughing and mocking me I wrote to him about that about what she did and that she must be his secret lover. Because she seems to know a whole lot about him too. Afterwards after checking her IG she deleted a group photo with him. Is that coincidence? she had that photo for a long time with him on her IG
Did he tell her about that or was that coincidence?
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