What happened/Will he come back

I have been seeing a guy for about a month who sounds textbook BPD, and has recently been diagnosed as it. In the beginning, he was super into me, wanted to commit to me in the first week, and then after that pushed me away multiple times. He would end it for various reasons, the most common being that he couldn't do it, but then always come back wanting to try again. He recently did this again, and the last time I was at his house he told me he felt like he was in love with me, that I was the first person he cared about in a long time.He also said he has days where he goes from feeling in love with me to feeling nothing at all.He also stated that "I was very close to being important enough that I could potentially hurt him". I ended up saying I felt like he could be in love with him too. He said he didn't want to hurt me He then vanished. I kept trying to get him to talk, and he kept ignoring me. I ended up leaving a voicemail with my thoughts letting him know how badly he hurt me by ignoring me. He finally answered me with a text saying he wanted to be alone and only responsible for his emotions.
Why did he disappear after saying he felt like he loved me and me reciprocating that? Why did he ignore me? Is it easy for him to ignore me or hard for him too? Is he going to come back?

i do not know if he will come back ,he might go back and then leave and then go back again.
i realized from personal experience(i do not know if everyone is like this though) that when things get worse and more triggering is when they have you.he has your love now he has something to lose,it gets worse from there.at first when he tries to get it is easier because he doesn't have anything to lose yet.
but you can't live without never loving him so is ###$ up in general

hey, i am in same boat right now, i am not even sure if she loved me she never said it but what i am sure she used to always come back but this time i am lost because she knows i have somebody in my life it would be big challenge for her