How would you feel?

Little by little i keep finding out info about my boyfriends past, we known eachother for 3 years and been in a relationship for 1 before that we just dated messed around i never really asked for a title even though i wanted one because i was happy just being with him and he wasnt ready little did ik he had a gf, then i just start outting the peices together like o thats why i was blocked from your fb, o thats why i aint here from him for some months one if the exs that hes with even said they were planning a baby, idk how to feel about this were moving in together and ttc and its like im finding out our whole happy store of how we met is a lie basically