Why am I logged into adopt even though I'm not?

Hello, I hope you can help me.

I have recently started talking to a woman, we get along very well, exchanged numbers, 3-hour calls, it's really great...

However, the problem is that yesterday she saw me online on the site even though I didn't open the app, so of course this morning she trusts me less...

I don't know what to do to make her see reason.

Is it possible that the app could have opened on its own or something? Any explanation?
Have a good day everyone.