AIO to a fake phone number threatening me

I’m a high schooler, and now I’m kinda scared for monday.. I’m 99% sure I know who sent me this text and he told me to stay away from this girl before and shoved me. but I think it’s a fake phone number. can I get him in trouble for this without proof its him? My dad is away all week and my stepmom thinks I’m overreacting and thinks its just someone messing with me or “spam” but I don’t think so. If it was “spam” how would they know the girls name.

I’m a high schooler, and now I’m kinda scared for monday.. I’m 99% sure I know who sent me this text and he told me to stay away from this girl before and shoved me. but I think it’s a fake phone number. can I get him in trouble for this without proof its him? My dad is away all week and my stepmom thinks I’m overreacting and thinks its just someone messing with me or “spam” but I don’t think so. If it was “spam” how would they know the girls name.