Me and my bf said I love you after 2 months of dating and we’ve been dating for almost 2 years now. It honestly depends how you think both of you are in the relationship and If you guys have the same goals in life ( want a family together, talk about getting married...etc)
Definitely say it when you’re ready!!
I get it that you don’t want to get rejected or that he might think it’s too early..but if someone doesn’t say it first nobody will.