i cant say that you will be able to forget it ever, though if you are busy with other things you will not think about it too often. that insecurity may always stay with you though.
it can be difficult to move on and have a healthy relationship if you are not able to forget what happened. talk to him honestly about your feelings, and tell him that from now on, you want your relationship to be absolutely honest and transparent. i think both of you will benefit from visiting a therapist. do think about it.
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