Boyfriend good friends with girl I do not trust

She’s one of my friends, but we’ve grown apart in the past year. I cannot STAND the feeling I get when I see them together. When he hugs her or tells her she looks pretty or whatever, I get so jealous. I’ve been ignoring the feeling because I don’t want to seem controlling. The thing that really gets me jealous about the situation is the fact that she used to have feelings for him. I don’t 100% know that her feelings for him are gone and that they wont come up again. I hate feeling this jealousy. I don’t know if I should push it back down or tell him I’m feeling jealous and uncomfortable. I really don’t care if they talk or spend time together, they’re friends, but I just don’t trust her enough to be okay with him hugging her or calling her pretty or whatever.