Please help!

Any advice would be much appreciated! To cut a long story short I’ve been in an emotionally and mentally abusive relationship and it all started around a year ago! Over the past lot of months it has got physical! Every time I try to break up with him he blackmails me, manipulates me and says he’s going to ruin me! I literally feel stuck!! Like i can not escape!! He has photos of me on his phone (which I sent him) but obviously back then I didn’t think he was actually going to use these against me? What I’m asking is, is this a police matter? Will they take me seriously if I go to them about this? I have asked him numerous times to delete the pictures as they are of me and I don’t want them on his phone anymore and he refuses! I don’t know what to do! I shouldn’t have sent the photos in the first place, its never been my thing, but anything to please him I guess? Please help, I finally feel like I’m ready to walk away and once I take that step he hits me up with something like this! I can’t do this! He has drained me, made me question life and I see no way out of this! As silly as it sounds! I’m really struggling at the minute!!