Husband threatening marriage fraud

I met my husband online and we got married when i flew to the US to meet him as we had often discussed..we talked for almost a year before and this was something he wanted as much as i did cos we were in love. When i was there alone with him, he often was verbally abusive and even strangled me , threatened me with guns etc.. i also found out he had a prior record for molesting an underage girl. Online he was sweet and empathetic and portrayed himself to be someone he was not in real life. He often belittled me and yelled at me in public simply because i could not cook chicken how he wanted or he felt the bathroom was not clean enough. Other reasons were that i spent time with my family who only came along to see me off due to concerns over my safety. 3 Days after our marriage i left when he was at work for fear of my life. My parents helped me with this because they too had witnessed his rage and were worried he would kill me. He has made threats on the phone since i returned to my home country about how he should have murdered me while he could and that he hopes i die and if im pregnant (we had unprotected sex) the baby rots inside me. I returned to my home country even before our marriage certificate was aprroved cos i was scared to be alone with him...now he is threatening to report me for marriage fraud ..can he do this? i did not overstay in the us and i did not even apply for green card so how can he do this? Will the authorities simply take his side when he does have a criminal record of violent crimes including the sexual abuse of a minor. (another reason why i left) I realise i was blinded by love and acted stupidly in marrying a man i had only chat with online previously but i fled the US because i was afraid he would hurt me not because of any kind of immigration fraud. On the contrary , if i was using him for green card then would i have not stayed at least until the marriage certificate was finalised and approved? He is turning our relationship issue into some lie about me scamming him for a green card. Also he told me repeatedly when i was in the US with him that if and when he chose to beat me or harm me (he did strange me) that i could not call the cops or seek any kind of assistance as they would lock me up in a detainment camp for not being legal. ( even though we did get our marriage certificate obtained from government office signed by a preacher)

Are you actually married if you left before the certificate was approved? I did a quick Google search and the general consensus is that you can divorce him in the UK but you'd need his address etc. I think it's a lot more expensive to divorce someone in the US, so he may not bother trying. It sounds like he wanted someone to control and probably already had the threat of getting you into trouble ready for when you wanted to leave him. He certainly doesn't sound like a very nice bloke so its good you were able to come back to the UK. You may have had a lucky escape.