Most often we ask our self "how to win back my lover even if they cheated."
It is easier to make someone fall in love with you again then it was for the first time. When you have already been partners, you have a shared history. Sure not all of this time will have provided great memories but some of it will. You just need to think of the good experience you have and not to dwindle on the bad one.
I presumed that you did not lose your partner's love and affection by having an affair. Having an affair will damage any relationship but it does not need to end. It can be natural reaction to be angry. But when you think about it, does the fact he slept with someone else really mean that you should end something that was good for most of the time.
Of course it will depend on the situation. If he had a one night stand and is now full of remorse that is one thing. But if he has been having an affair for a long period of time, that is a completely different matters to think about. The one night stand is easy sex, the long term affair is emotional betrayal and lying both of which hurt a lot more. The long term affair will do a lot more damage to your relationship.
But it still does not have to be the end. Affairs happen for all sorts of reasons and so long as it has not been a pattern through your whole relationship you can fix things if you want to. But if you were the other woman when you met, and now he has moved onto another person then you are in trouble. That is the problem when the mistress becomes the wife. She often are available.
So how to win your love back? You need to educate yourself on how to make the most of your relationships. Because people get together every day, we often just assume that this is something we should know how to do. After all the secrets to successful relationships is not being teach at school.
Well money management is not either taught, yet both are very necessary skills for leading a happy life. So get yourself an education. Start reading and listening to all the information you can on how to rekindle past love. How to build successful relationships and have happy marriage. There is no end to the amount of information available. Just be sure you pick a course that has been used by many happy customers who have been so pleased with their results, they have posted testimonials to the effectiveness of the course.
In no time at all you will no longer be asking "how to win my love back" and will probably find your friends are now looking for your help on how to achieve the happiness you now have.