To be clear: you would never be in any way responsible for problems associated with your partner taking hormonal birth control because it is a choice they make themselves for their own body.
> Instead I took responsibility for making sure she wouldn't get pregnant
You have to understand what a big statement that is. If she does get pregnant there’s only one person guaranteed to have to deal with the consequences of that, and that’s her. Being hesitant to transfer the responsibility to you is very rational, being mad at you over the topic is understandable.
I know your intention is good throughout here but there’s an implication that you know what’s better for their bodies than they do. A better approach (IMO) is to inform them of the risks (which you’re right they may not know) and let them make their own choice.
The “context of a relationship” part is when a couple decide to cease birth control in order to have a child together. The OP is talking about still using birth control, just different birth control that he would prefer she use over the alternatives. Ultimately that should be her choice because the end result to him (no pregnancy) is the same.
>Women take birth control for a number of reasons unrelated to pregnancy
Yes, but don't forget about the elephant in the room: There are a lot of women on birth control who wouldn't be if they weren't trying to avoid pregnancy.
>Ultimately that should be her choice.
Were you under the impression that he was physically preventing his girlfriends from taking birth control?
No, because even if she chooses to terminate the pregnancy and not tell the other party a thing, she is still guaranteed to have to deal with the consequences of that decision. Or if she miscarries before she even knows she is pregnant, she has to deal with that, it’s not a pleasant experience for anyone. Etc.
> Instead I took responsibility for making sure she wouldn't get pregnant
You have to understand what a big statement that is. If she does get pregnant there’s only one person guaranteed to have to deal with the consequences of that, and that’s her. Being hesitant to transfer the responsibility to you is very rational, being mad at you over the topic is understandable.
I know your intention is good throughout here but there’s an implication that you know what’s better for their bodies than they do. A better approach (IMO) is to inform them of the risks (which you’re right they may not know) and let them make their own choice.