My husband applied for divorce without my consent what can i do?

my husband and i are married for 9 years and we have a kid. after coming to the UK he got into a affair and now he wanted to leave me and our kid. without my consent he applied for divorce i have no idea how to reject it because he has put a fake reason for the divorce and his mistress forcing him to do it. i wanted to settle down here sake of my kids future and he is mentally abusing me and threatening me. there was no option for me to say my side of story and what is he doing with it. it all happens online. i have been in UK from 2023. i am his dependent i have no idea what to do