<human>: This is difficult.  We're both 26 and have been together for almost two years.  I'm the only girl he's ever been with.  First kiss, first sexual experience, etc.  I mean everything.  I've been with several men, so I know what I like and my fiance is exactly what I want for the rest of my life.

My friends think he'll want to experience other women later on down the road and this is what scares me.  He claims that I'm more than enough for him but I can't help but be a little worried.  Anyone have advice on how to handle this?  I just don't want to lose him.

Could you distill the essence of the text into 1-3 sentences?
<bot>: I'm (F26) my fiance's (M26) only sexual experience.  This worries me that he may want more experience later on.