CiTX, I am so sorry for what you are going through right now. I wish it wasn't happening, but it is, and it's very important that you act in your own best interests now, and in the best interests of your child. This means letting go of things he said in the past and focusing on how he is behaving right now. Actions, not words, tell you the truth. I, too, don't understand how someone goes from "I love you" to ignoring you in the space of two weeks, but understanding that is not your biggest concern right now.
Is there somewhere you and your son can go? Family you can stay with while you work out your next steps?