Does he still see these ex's? if not i wouldn't make such a big issue out of the pics. Everyone is entitled to their past and if you discuss the past with him and he is willing to share with you then you have a close relationship. Don't push him away with your jealousy and possesiveness. They are only good qualities if in the right ratio. Understand? It is not very attractive or realistic to expect your partner not to ever have loved someone else
Godd bless
Trust your intuition
it is hardly ever wrong