Something I just thought of...

I have sinned yet again (no surprise there) and I have prayed about it. But now I don't know if God has blocked me and stopped forgiving me forever, just as how I stopped helping and blocked that one person over the Internet after becoming tired of helping them for the past few months or so. I thought of this because of that one line in the Bible that states that God will treat us exactly like how we treat another person and well, now I don't know what to do. I do still pray, whether or not God forgives me or not, but I still find myself repeating the same sin and even though I prayed stating I know I should be more repentant, things haven't changed all that much and I still fall back to where I was...