Every single girlfriend I had, I asked her to get off contraceptives because of the medical dangers and I didn't want to be responsible for any problems associated with it. Instead I took responsibility for making sure she wouldn't get pregnant. One of my girlfriends actually got mad at me because I was *too* careful about getting her pregnant, and interpreted that as me not wanting to get married to her (which since…
Wow. I'd probably break up with a guy who "asked me to get off contraceptives". If you want to be responsible about preventing pregnancy, that's fantastic. If you feel like that's any more than an input to her decision of whether to be on it, that's a pretty fundamental overreach.
I didn't force anyone, we had an adult conversation about it and all my gfs were on the same page. If any one of my gfs wanted to stay on contraceptives in the first place, then great, I would still do the exact same thing to avoid getting her pregnant in case she missed a day, etc. My wife wasn't on contraceptives in the first place so it was basically a non-conversation.
I think having an adult conversation is basic expectations for any healthy relationship. If you interpret broaching a subject as being cause for breaking up with someone... well, that's your prerogative.