I'm dating someone who has cheated in the past. What should I do?

I would personally watch out for signs they may be cheating. Be more alert as they have done so in the past. Although, also keep in mind - though this may be their past behaviour, maybe they have grown and changed since then.

As long as they don't cheat on you - you should be okay. Sometimes we have to meet the right person, some people do not like to commit to others because of their own sense of self - hopefully that does not happen

Trust and communication is the foundation of all relationships. Talk to him about your feelings. Do not let these thoughts invade your headspace, just be happy in the relationship

You have to give the person the credit he deserves. Dont let his mistakes define him or your relationship :)

Leave the person, by staying with the person you're doing nothing but prolonging your own suffering. End the relationship and start working on yourself. Might be best to not get involved in another relationship too quickly until you've managed to get over your last one and better manager to coope with your own emotions. Also remember to always forgive... But don't forget, no one deserves to be defeated like that

Trust, the foundation of a relationship. If you’re entering a relationship with someone you should always make sure you’re both on the same page concerning the boundaries and expectations, for example; no intercourse with anyone outside of the current participants. But when you find yourself in a situation where this trust has been broken it can be very hard to get it back. Very hard, not impossible. If both people are willing to work at it and commit to repairing the relationship then it can get back on track. The key to anything is communication. Ask questions, be prepared for answers. Ask your partner why they felt compelled to cheat and why they chose presumably not to confess after the action. If, and hopefully they are, remorseful then bridges can be built and steps can be taken towards a stronger relationship. That said, if you don’t like the answer no one says you have to give them a second chance. Just because you’ve been with someone a long time doesn’t mean you owe them or the relationship anything. Knowing when to walk away is just as important, especially where mental health and self worth is concerned. No one outside of this relationship should dictate to if you stay or leave, take friends and family advice with a pinch of salt, ultimately it’s you that has to make a decision on your relationship.

There is a law of life which says "When you love someone, set it free. If it is yours will come to you. Otherwise it is not yours". Discuss and let him/her choose.

Just give them a chance cause people can change. Just cause they did it then don't mean they will do it now

You should be able to trust them. I can't give you advice or my opinions, but you should be able to tell if they are committed as loyal towards you.

Remember that everybody makes mistakes and should be given a second chance. If they then repeat their actions that's when you decide if they're good enough for you or not.