My boyfriend with bpd broke up with me a little over a week ago. He started an argument, I remained cool, calm and respectful throughout but it ended with him breaking up with me so because he broke me, I said fine I'll start dating my neighbor now (he knows my neighbor is into me). I know I shouldn't have said it and I definitely don't like my neighbor, I only like my boyfriend but he had broken up with me so quickly that I got upset and said that. After I said that he said now we definitely can't ever be together but that was confusing because he just broke up with me and he tells me he's really breaking up with me. So the first time he said he's breaking up with me was a lie?

He's still talking to me, still sending me messages but treating me like we've been friends this whole time. Like his feelings for me, his love for me just suddenly doesn't exist. He's sending me good night messages too but after a few days I told him we can't be friends. He said it would hurt him but I stopped talking to him as much and he's still been sending me messages especially good night messages some I say good night to but I recently stopped. Here's the recent one:

"Hey. I know you don't want to talk to me as much and you might not read this today and that hurts but I can't go a day without wishing you a good night. I hope everything is okay with you and that you have a good night"

Those kind of messages don't make sense when he's been telling me we can't ever be together after what I said about my neighbor even though I already cleared that up and apologized so if we can't be together, why is he still wishing me good night every day without fail? 

Thanks if anyone can offer any possible explanation or thoughts on this!