If you feel that you made a mistake in the relationship and have attempted to make amends, move on. Don’t be hard on yourself for things that you cannot change.  To help alleviate guilt, try reminding yourself what you did right, either in the relationship or outside of it.  Envision a time when you were supportive, loving and loyal to those around you. Determine who is behind the guilt that you’re feeling. Are your friends wishing you would get back together with your ex or is he manipulating you in some way? Determining which feelings are someone else’s and which are your own is important for figuring out if the guilt is warranted or not. If you had a favorite restaurant that you frequented together, make it a point to still eat there. Make reservations to go with friends in order to create new memories. This will keep you from limiting yourself and letting your sadness dictate your actions. If you shared a mutual friend with your ex who you still care about, try not to let the nature of the friendship change now that you’re no longer together. Remember that starting a new relationship doesn’t mean it will end like your last one did. Concentrating on how you feel you were wronged will make you appear bitter and unpleasant to be around. If you hold onto these feelings, you could miss the opportunity to meet someone amazing in the future. Allow yourself to learn from past mistakes, but understand that no two men are the same. If you begin to notice an unhealthy pattern within your relationships, consider how you can avoid this. Whether it’s being taken advantage of, or letting a negative side of your own personality take over, recognize that failure to change this habit will result in a similar outcome.  If the type of man that you’re drawn to keeps hurting you, address the reasons behind why you're drawn to this type of relationship. Talk with those closest to you who saw the nature of your relationship first-hand. Ask them for help in constructively evaluating what went wrong with your ex. Chances are that if your break up is fresh and you are still healing, even a friendship isn’t possible between the two of you for now. It will be difficult to have an objective viewpoint on what went wrong if you’re still in contact. Additionally, it may make it harder for you to accept the end of the relationship, which will only prolong your grieving process.  True closure can be difficult if there is still dialogue between the two of you. A clean break will make acceptance of the end unavoidable. If he is the one contacting you, consider changing your phone number and email address. Delete him from your social media accounts so you aren't forced to inadvertently think about him throughout the day when you login to your accounts and he's posted an update. If you don't want to delete him altogether, most apps have ways of blocking people, as well. While you may be tempted to do whatever it takes to relieve your feelings of loneliness, you will be further behind in the long run if you rely on something as destructive as these numbing agents. Drugs and alcohol will block your feelings, and put off the grieving process, rather than getting you closer to starting to heal.  There is a chance you could develop an addiction, producing another issue to overcome. It's possible you could drive away friends and potential future mates with this harmful behavior.

Summary:
Don’t focus on any guilt that you’re harboring. Don’t go out of your way to avoid places or people that remind you of your ex. Don’t allow lingering negativity to get in the way when you do meet someone new. Don’t keep doing the same thing and expect different results. Don’t find reasons to contact your former lover. Don’t use alcohol or drugs to escape from your pain.