How do I get over this fear?

File: image.jpg (83KB, 640x960px) Image search: [Google]

83KB, 640x960px

What should I do about the fear that my boyfriend has/had a more meaningful and intimate relationship with his ex/s?
I'm afraid I could not measure up.

I have only ever dated 2 guys, but I had the same worry.
They both have/had (one is my boyfriend, one is my ex) at least 1 ex girlfriend that they kept in touch with via social media and have longed after for a while after the girl flaked/broke up with them.

>ex's oneitis was a crush from elementary to highschool
>they haven't even met for years
>only gf he ever had before me

>boyfriend's oneitis was freshman year hs gf
>she broke up with him all of a sudden through fb
>did not explain why, and had new bf online days later
>moved to a different state, dated around
>visited family back home, also visited him
I believe he started online dating after that, and that is how we met.

Both guys have posted a ton of sad hopeless love romantic things from these times, (being infatuated, and having met oneitis by accident again) one even wrote a poem about a breakup. They both lost their virginity to me, meaning that they most likely haven't seen another girl naked in real life or have done sexual things with her. This leads to some idealized perfect imagined body of the past oneitis, meanwhile my body is no longer a mystery to them. (Got no complaints but my skin isn't perfect)
All the desperate and romance posts stopped when they started dating me, making me think that I don't compare.

My ex never posted a thing indicating that we were dating, only after I broke up with him he spammed his wall with emo break-up songs.

The ex girlfriends kept popping up when they were lonely (public sad posting followed by reaching out to my boyfriend) or when they had birthdays the girl always had to make her comment special with smilies or hearts and all caps..

The ex of my boyfriend liked pretty much everything he posted, but never anything relating to me.