Few people look forward to marriage if they think their partner is highly likely to be unfaithful in the future. Nobody marries someone who has proven to be unfaithful in the past, is currently being unfaithful, and is highly unlikely to continue this behavior in the future. Yet this is exactly what God called Hosea to in marrying Gomer. Gomer was ransomed by Hosea, at his own cost, called to buy her back from her pimp.
This marriage was an illustration of God's embrace of Israel. Despite her adulterous behavior, God had pledged himself to chase her down, redeem her, and love her, even as she continued to call out to other suitors. Understand what is proclaimed here; God will love her even while her unfaithfulness remains ongoing. He wants her even when she wants nothing to do with him.
For a majority of us, there is not a single relationship in our life that reflects this kind of radical love. Your employer most surely would not keep you on board if you collected checks while doing work for another company. Your friends won't be so friendly if you're regularly dismissing their overtures and telling others how much you don't want to be around them. Even your spouse will sometimes confirm their love for you in order to get you to do something. "You know, if you love me, you'll....." And chances are, you have strings attached to your affections for every person in your life.
This is not the case with God's love for us. His care and concern for us is entirely unconditional. Even with our rebellious dalliances, God does not give up upon us nor change the manner in which he engages us. He is with us even when we do not want to be with him. Our God does not give up on us. Nor does he stand by and let us continue on our own way. He fights for us, he appeals for us, he stands by our side. He loves without reservation. It is this love that changes us and perseveres in us until the day we are made perfect by his love.