OP ( I can't even bare to say your username ) you have NOT overreacted. Take no notice of that poster, says something we've all read your thread properly and know you had a conversation prior and his addition and reaction says it all.
You have been incredibly brave and strong although I doubt you feel it, I'm glad you had a quite chat with rape crisis, and you've had it confirmed the way you were spoken to by a police officer wasn't right. Once you feel you have a bit of a clearer mind etc easier said than done, an hope I've not offended you saying that :( I'd definitely make a complaint on that officer, he can't spout off untrue shit. When I was raped at 16 by a man 10 years older than me, did I signal I wanted sex because we were having a laugh? 
I am absolutely disgusted over how you've been treated! We all believe you! And I pray you get your justice. Him threatening to commit suicide is because he's a selfish, vile scumbag who put getting his "fix" before your feelings especially when you told him no prior. Just because you had some form of foreplay DOES NOT give him the right to "assume" you want to have sex. I just can't get my head around why one poster would give this impression
I'm sorry if I'm rambling and talking any rubbish, I don't wish to offend, I have no long come home from the hospital after having an operation so I'm still a little all over the plac, but I had to check on you sweetheart
If you want to curl up into a ball, do it!! It you want to scream or cry, you do it!
I'm not too sure whether I live anywhere near you, I'll go back and check through but PLEASE feel free to PM me whenever you need to rant, offload or just need some advice or a chat to talk about anything else to take your mind off it all
I know exactly how you're feeling OP, and you WILL get through this, and one day you'll look back and realise just how incredible and strong you were and are!
I still think of everything I went through 10 years later and I don't think I'll ever realise just how fucking amazing and strong and determined I ended up being, and at the age of 16. I wish I could tell every survivor they really can do this and how strong you all are
I'll stop rambling now, but once again OP,
100% hands down I believe you 