What do I do about me feeling threatened by my boyfriend meeting new girls?

My boyfriend and I have been together for 3 years but 1 year long distance. We’ve been great and see each other as much as possible! He has a friend who is a girl and is a battle buddy of his, and she throws parties. I looked at her party picture album and saw pictures of him surrounded by 4 girls. It wasn’t sexual or anything, but just a picture and some silly ones..but now I feel a bit threatened because he could easily date one of these girls and leave me.

I’m feeling insecure, should I talk to him about it so that I feel better letting out my feelings? I kind of don’t want to tell him I’ve been snooping on his friend’s page at the photo albums (even though it’s public).

I know I shouldn’t feel this way but it’s hard when it’s long distance.