I was saved, I believe and love God with all my heart. But I live with my boyfriend. I ask for forgiveness and I still go to church, but lately when I walk in church I feel so ashamed. What do I do? Will God forgive me?
"For this is the love of God, that we keep His commandments; and His commandments are not burdensome" (I John 5:3).
You don't realize it, but it is a contradiction to claim to love God while simultaneously refusing to do what God commands. Thus, I must disagree. You have some love for God, but it is not with your whole heart. Your heart is divided between your love for sin with your boyfriend and your love for God.
"Now the works of the flesh are evident, which are: adultery, fornication, uncleanness, lewdness, idolatry, sorcery, hatred, contentions, jealousies, outbursts of wrath, selfish ambitions, dissensions, heresies, envy, murders, drunkenness, revelries, and the like; of which I tell you beforehand, just as I also told you in time past, that those who practice such things will not inherit the kingdom of God" (Galatians 5:19-21).
Asking for forgiveness of a sin that you continue to do is just expressing empty words. Since you understand that fornication is wrong, change! "For behold what earnestness this very thing, this godly sorrow, has produced in you: what vindication of yourselves, what indignation, what fear, what longing, what zeal, what avenging of wrong! In everything you demonstrated yourselves to be innocent in the matter" (II Corinthians 7:11). After you change, then go to God and ask for forgiveness. "The Lord is not slow about His promise, as some count slowness, but is patient toward you, not wishing for any to perish but for all to come to repentance" (II Peter 3:9).
You basically have two options: move out and stop the sex, or marry this boy instead of pretending (I Corinthians 7:8-9).