For this reason I say to you, her sins, which are many, have been forgiven, for she loved much; but he who is forgiven little, loves little.” Then He said to her, “Your sins have been forgiven.” Luke 7:47
Some people can forgive, some can not. There by the grace of God go you and I. At times we forgive others and times we ask God for forgiveness and at times we want to forgive ourselves. If she has found the Lord her past life is not remembered by God, nor should it be remembered by you unless you want God to remember your sins. Forgiveness is a tenet of Christianity. Christ had mercy on us, what are we if we do not show mercy for others? We take but not give?
From there you have to follow your heart. Sometimes God puts people in our path to test our Character. What have you done to her life? Part of this Christian journey is about how we impact the lives of others. If she loves you, what have you done to the one that loves you? And will you ever deserve love again.