Is this sexual assault?

my crush keira, has been stalked recently by my bully, and i found out just recently from her that peters (my bullies last name) has pinned her against the wall in the school parking lot and tried making out with her regardless of trying to get him off, and on a side note, my friend sean told me that peters "put his hands" on a girl close to him, is what he did to keira legally sexual assault?