Vibrators in bed: My boyfriend is apprehensive?

We have tried many times for me to have an manually but its just not happening. I can have an easily in the tub with running water. I read that some girls have a more hooded oris so they need more stimulation than what a guy can do manually. i mentioned bringing a tiny vibrator into the bedroom a few times but my boyfriend got quiet and weird about it all 3 times. I think maybe he's not sure what we would do with it or something. What should i do? if keeps being a "happy ending" for him and not me I'm going to get frustrated and, sadly, i can even see myself looking elsewhere for a relationship.