Ex boyfriend making up things and showing off.

My ex boyfriend (broke up with him THREE YEARS ago, relationship was a pathetic three months long.) keeps telling this boy I like about our sexual encounters with eachother, aswell as making up things to make himself known as 'good in bed' or some ****. I can't help but feel guilty and embarrassed :( I lost my virginity to this boy, but now the other one is beginning to ask about it. I'm slightly mortified, why does my ex have to mention it three years down the line and 12 partners later? We don't really speak, so I don't see why he should. What should I do? :(

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