If so you need to sit down as a couple and talk abbot how things have changed. Find the things that first attracted you to one another, then commit to start over together.
It may take some time so you both will have to be willing to really work at it. You can start off by forgiving one another, then forget about the past. Focus only on the positive about your mate and let the unimportant things go. Just remain patient and give it enough time and you can be on the way to romance in your relationship again.
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