What should I do?

My bf and I have been dating for 6 months now. 2 years ago he ended a 7 year relationship with a girl who went to my school (she was known to be the mean girl). I was very hesitant to date him for this reason. They still have all their pictures together and would always show large displays of affection. Writing I love you under every photo and that she was the best thing that ever happened to him. She ended up betraying him and so he left her.
We have been dating for 6 months now and he has not told me he has loved me yet or doesn’t call me baby or love.
He told me he has a difficult time of expressing himself but I didn’t feel that was the case when he was with his ex. I just feel like I’m more into the relationship than he is and I want to avoid that/get hurt. What should I do?