Trust issues now.

My husband told me a few nights ago that he kissed another woman( an old flame) 7 years ago, before we were ever married or engaged to be, but a year and a half into our relationship. He insists that he has been completed loyal since and it has always killed him that he did that. I'm very hurt by this, and I can't seem to get over it. I look at him differently now and I'm afraid that things will be different. Any advice ladies? I love him and I know he's faithful, it just hurts and I'm pissed. I almost wish he never friggin told me.