Melanie,
I am in agreeance with Ellie. But just one addition to the comment.
The words of Jesus himself when he was hanging on the cross and dieing for all mankind and even those who treated him mockingly and horrible and with disgust,(even for the rapists, murderers, adulterers and abusers etc...) He was dieing for them and their sins that they might be saved and the words he asked of His Father in heaven was ,"Father, forgive them for they know not what they do." He asked God His Father to extend forgiveness to them just like he does even now while he is at the right hand of God the Father making intercession for us. God is long suffering with his people. You could ask God to be with the "pastor" and that the Holy Spirit would bring conviction to him for his error in the word and ask that God would save his soul because Jesus died for all.
But if that man came up to you personally and said ,"you need to forgive me" when he didn't truly have sorrow for his wrong doing. You would probably need to ask , "have you repented of your sins?" If he shows that he has NOT, then you would not need to say, " I forgive you" because if you said you forgave him.. It would make him think that he is extended grace with a proud and unrepentant heart. It will make him think he is justified to continue in his sin and continue to do wrong. James 4:6 says that God resisteth the proud but gives grace to the humble." Now if this man or any trespasser comes to you and is humbled in repentance for the wrong against you and asks for your forgiveness then you graciously extend him forgiveness.
(I know this is a quite a bit of scripture below and the scripture I am referring to is at the end but think it wise to read all that is around the scripture that is referenced.)
Matthew 18:15-22
King James Version
15 Moreover if thy brother shall trespass against thee, go and tell him his fault between thee and him alone: if he shall hear thee, thou hast gained thy brother.
16 But if he will not hear thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established.
17 And if he shall neglect to hear them, tell it unto the church: but if he neglect to hear the church, let him be unto thee as an heathen man and a publican.
18 Verily I say unto you, Whatsoever ye shall bind on earth shall be bound in heaven: and whatsoever ye shall loose on earth shall be loosed in heaven.
19 Again I say unto you, That if two of you shall agree on earth as touching any thing that they shall ask, it shall be done for them of my Father which is in heaven.
20 For where two or three are gathered together in my name, there am I in the midst of them.
21 Then came Peter to him, and said, Lord, how oft shall my brother sin against me, and I forgive him? till seven times?
22 Jesus saith unto him, I say not unto thee, Until seven times: but, Until seventy times seven.
If there is repentance. Extend forgiveness. If there isn't ask God to convict them to repentance for their wrong. We do not want anyone to perish. Praying for the unrepentant will help us to see them through God's eyes and it helps us to not become bitter. When you have more trespasses in the future (because you will) ask God to help Prepare you now for those moments. Ask him to help you to have compassion toward those who hurt you. And to not have hate in your heart or resentment toward them. Because this is murder in your heart toward them.
Matthew 5:43-44
43 Ye have heard that it hath been said, Thou shalt love thy neighbour, and hate thine enemy.
44 But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you
I hope this helps. And if anything was said that doesn't line up with scripture. Please correct my error