boyfriend "liking" his ex gf pics

La

Tonight when on IG I found my bf's ex's Instagram profile. I was really upset to see that he had double tapped on 5 of her posts in the time that he and I have been dating. My bf is not a big social media guy so I was surprised he had liked so many. This has really bothered me. I feel that this is very disrespectful to me as I think I'm the only woman he should be looking at and double tapping 😩 Am I being silly or do I have a right to be upset about him liking his ex? ☹