Jealous?

Ive been married for 2 yrs and dated my husband for 4 yrs before getting married.... before my husband i had this ex that i was totally in love with him since i was 8 yrs old... we dated when i was 13 but couldnt continue with the relationship because his dad didnt wanted to n he obey him..

I was still in love with him cried over him blah blah blah until i met my husband.... now he has a gf(my worse enemy) that he made it official with everyone i know and even his dad allowed him to date her... and idk i feel sad!! N sometimes mad!!! I know im over him now because im happy with my husband... but when i see him with her it gets me mad n sad!!! Do you guys think its Jealousy???