Tw: I was raped. Is it to late to say something?

When i was 15 my ex raped me. After an argument. This happened in late December 2016 but i cant get over it, it still feels like it happened a month ago. We went out and had a argument because he didnt like a little present I got him, he was so mad that I had got it wrong . He dragged me out the shop and had such a tight grip on my wrist it burnt, I tried to signal to people, mainly boys older and taller than him to try get him off me, but the more they looked the harder he'd squeeze. He took me tl to the station, took me home and proceeded to text other girls about how he was bored. He told me unpack his bags and get his new jumper out , I just threw his jumper over too him as I knew he wanted it so we could go watch the christmas parade, but it hit him harder than I thought and he got so mad and was screaming at me that I had pushed it too far, i ran out the flat and a women tried to help me she was asking if i needed police, if I needed help, I tried to explain what happened but he had followed me down and seen us talking, he told her I was having a panic attack and I needed to go home, she believed him and he took me back to his shut his door and pushed me on the bed and started undressing me. I asked him to stop. Begged him too, I was crying and hitting for help, after 10mins I gave up he was 6ft I was 5'4 I laid in silence crying and listening if his mum would home early in or he would at least finish soon. After what felt like hours he stopped, went to the loo, came back and asked why i was crying acting like me and him never argued, like he didn't know what happened. i was shaking. we split in june 2017, he would make me give him head but nothing ever as bad as that one day. I have had a boyfriend since December 2018 since who I have told and my best friend. I am intimate with my current boyfriend but everytime at the start as soon as he's on top of me I cry and it puts him off and makes him feel like hes making me uncomfortable but he isnt, hes so nice and takes his time and always asks beforehand, how do I get myself out of this mindframe after all this timr want to make new memories with my boyfriend now and have positive associations to sec but i keep getting flashbacks and nightmares about it even too the point where i stayed at my boyfriends woke up at 2am thinking it was my ex in my bed not him and crying but really i was having a weird half real half asleep dream.. Its too late to report it now as i have no clue where my ex is as last i heard he was moving back to his home country 😔 Do i tell my mum? My boyfriends kept it a secret as he knows I've coped alone for so long, but i know he wants me to get help for my own sake. Thank you for reading..