Darcy, I know a situation like this is very difficult. I would say that turning the other cheek, blessing those who curse you and loving your enemies is a good course of action when it comes to a non-believer but a christian is never your enemy. If it is someone who claims to be a Christian, weather or not they act like one, the bible tells us that we are to seek to try to restore them into fellowship with us. This is a process that takes much prayer to plow up any fallowed ground on their part and a fresh crop of the fruit of the Spirit on your part. Matthew 18 gives us clear instruction regarding restoration. I would never approach a person until my heart was broken for them, and out of love, I wanted to help them in their walk. Sometimes it takes some extra time interceding for them to get my heart to this place. We must go with humility and brokenness otherwise our rebuke will be taken as offensive. Oftentimes I have found that the Lord will deal with the person before I can even do anything about it, that is, if I spend this time in prayer. If the situation still needs to be addressed after that, we should follow the following steps laid out in Matt:18 15-17
18:15 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. I don't know the situation, but many times when people treat us poorly it is because we have offended them in some way. If that is possible, you might ask the person if there is something that you did to offend them. Be prepared to make right whatever they may tell you you have done. If they don't bring any accusations against you, that would be the time to address their offence. If they don't want to hear you or they dismiss the thing as unimportant. Give them a little space to repent and if there is no change then you move on to the next step.
18:16 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. It is important that they know how important restoration is to you. Sometimes it takes a witness to let the person see that you are serious about the problem. Hopefully they will repent at this point. 18:17 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. Since this person does not fellowship at the same church that you do, it would be fruitless to take it to your church. But it may be a good idea to call the pastor of the church this person attends and set up a meeting between you and this person to try to resolve the situation. Of course this step is extreme and should be the last resort as it can cause more problems. If this person does not attend a Church fellowship then ask God to give the person over to the Devil for the destruction of their flesh that they might come to repentance. Jesus tells us not to fellowship with them. Treat them as you would an IRS agent who is trying to make you pay unnecessary taxes or like a strange drunk on the street. If it is a co-worker, keep everthing on the business level but avoid contact with this person. Because we are Christians we should not have fellowship with the unfruitful works of darkness, so we must commit to pray for a person like this until they repent or the Lord removes them from our circle. In time if the person comes to you and repents, restore them with a Spirit of meekness and accept them with love. Hope this is helpful. Blessings, Pastor Mike | 
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