God is gracious, and He'd rather someone be free from abuse than suffer throughout the duration of an entire lifetime.
I believe that God is more concerned with holiness than happiness. Otherwise, why would he instruct slaves on how to be obedient to their masters irrespective of the situation, instead of telling them to run away and be free and happy?
This doesn't seem like a mature scriptural view to me.
But there is grace. I suppose you have to decide how God would have you honor Him with your heart and your decisions. If you ask for advice on what scripture says, you are likely to receive confirmation that the bf did the right thing by getting out of the relationship.
My personal opinion on abusive marriages is that this is exactly what separation (not divorce) is for. And separation is still marriage, therefore, not a place from which to have other relationships, otherwise it's adultery. The point is to preserve every possibility for reconciliation.
It breaks my heart, and I do ask for God to pour compassion, comfort, healing and restoration for you, as well as love, joy and peace. It's also important (though extremely difficult, I know) not to let bitterness take root. Don't allow unforgiveness to govern your decisions and conclusions. I need to follow this advice myself. Root yourself in Jesus and submit your very thoughts and desires to Him. He will help with the rest (Spiritual, emotional and physical), sister.
God bless and keep you.