Don't get me wrong. This is only a hypotesis.
I think you aren't being completely sincer to yourself and what troubles you is that you doubted for a sec. If you admit it and accept that we all are humans then you may be able to relax because humans doubt, make mistakes, etc.
If you doubted, there is no problem in that because it means that you unconsciously or consciously thought about it and in the end your love for your girlfriend got strengthened.
Don't tell her just tell yourself what happened and you'll be ok man.
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