I'm dating someone who has been cheated on. What should I do?

Try to reassure them that you will be there for them, if possible promise that you won't cheat on them although it should be something that you can keep.

Make sure they know how much you love and appreciate them. People who have been cheated on have a harder time trusting and falling in love with someone.

Being cheated on can leave people scarred. I believe all you can do is be there for them, make sure they get the feeling they can trust you and just love them. Try to have compassion for them when you notice they are struggling with trust issues. And try not to take it personally if they do. You are not the one who hurt them. I think if you really want to know what to do, what's best for them, it's best to talk to them about it, because everyone's different.

theres nothing you can do but to show them that they can trust you with everything you do, show you care

try to respect that they will have some issues from that relationship that may affect you relationship with this person. Being cheated on can make the person feel poorly about themselves and may affect their ability to trust others. All you can you is be supportive of them and be there while they learn to love themselves.

Don't be the person who cheated on the person. You need to show him that the person is your one and only King/Queen.

Understand some of their paranoia that might have been crossed over from the past relationship, and try and assure them that it wont happen again

To love them unconditionally, care for them and remind them that their past is just their past and that it doesn't mean that what happened then, will happen again

Try to reassure them that you won't make the same mistake their ex did, ONLY if you really mean it. if they ask you something, tell them so they won't worry about who you're with or what you're doing. Make sure you are honest and give them what their ex couldn't give them.

Treat them as you'd treat any other person you were dating, and as long as you don't cheat on them, it should be fine!