UNUSUAL big dick problem

my FIRST gf who is quite petite left me [for reference my size 8 X 5.5] for a GUY who was quite smaller than me saying... that smaller is better for her as she can have hardcore sex oftenly without feeling sore ... this has affected my confidence as i was quite in love with her and first time wished that i had a smaller manhood has someone faced something similar ?

UPDATE :- thanks for all the comments feeling much more confident now ... the girl i am talking abt here left me about 2 months ago but today in the morning i learned from some of her friends [ who were my friends originally ] that she has left the guy she cheated on me with and now maybe wants to get back together with me ...she hasnt contacted me yet but her chats with our mutual friends is insinuating the above sayng shit like she cant feel the current guy now and i was better ..i think i will just move on ...she seems like a dodgy girl thnx all