Step sons mom came back

Idk. I’m really glad that he has her in his life now. I am. But I just feel so pushed to the side now. She freaks out when I’m included with anything to do with him. But for almost a year he lived with me, I paid for almost everything for him when my husband didn’t work! I loved him like my own. And now all of a sudden she has time for him and wants to see him and I’m just not supposed to be involved at all?? I can’t go to his doctors appointments with my husband or have opinions? She saw him maybe a few hours a month for MONTHS and now I’m chopped liver. It kinda breaks my heart. I feel petty. He’s started coming back with this bad attitude too.. glaring at me and kicking and hitting at me. I don’t even know. I’m not going to tell this to my husband because it probably won’t make sense to him. I hope I don’t sound like too much of an asshole I just had to get this out somewhere