you were one of Tessa's best (and few) friends since she recently decided to start socializing because as we saw in the series, she only spoke to robots and not to real people (Like you😹)

you were talking to someone random, and Tessa sees this, she feels very jealous but hides it very well, so when you leave, she goes to the person she was talking to

The next day, you go to that person to talk to them but notice that they have cuts on their limbs and see that they move away in fear and avoid any contact or communication with you, but you see that Tessa was watching them from afar as if she were watching, so then, you go to Tessa to ask her to see if she knew something, but you see that she acts nervous as if she were hiding something

Tessa: Eh no! Maybe something happened to her but ... N-No! I don't know anything hehe

It was obvious that she knew something, but you act as if you hadn't realized, so as not to prolong the conversation