Pietro knew Alex wouldn't be happy with herself for revealing her spy past to everybody, it wasn't that much of a surprise though. She'd told him some of her past and he could understand why she had become a spy in order to get revenge for her parents. After all he and Wanda had allowed Hydra to experiment on them in the hope of gaining the ability they needed to seek their own revenge on Stark for their own parents deaths. In that sense they were very similar.
But Alex needed to talk to him about something properly and when she came over and they sat together he nodded, "Okay, you can trust me" he told her, laying a gentle hand over one of hers.