i guess we were supposed to chime in with messages of support that the OP is right.
the thing is that some people just aren't into it. guys or gals, some people just aren't into it.
i'm staying with a couple people at the moment... one of them is really into running. trail type running, i guess. 20k type races. she said she does want to get / keep upper body strength... but she simply isn't interested in going to the gym or lifting weights. i gave her some simple bodyweight exercises that are vertical-horizontal push-pull and maybe she will do some... or maybe she won't. don't know. the other one of them is into free diving. he does a little bit of weight lifting, but he really isn't all that into it. i tried to get them both interested in olympic lifting but they aren't really. he tried to get me interested in free diving and it does sound kinda cool. but i'm not really interested in it.
i think that exercise is a really very personal thing for people. sometimes people do have fears that prevent them from participating in various things (e.g., if i look at a weight i'll turn into a man) but often times the things people say aren't really the reasons they have... sometimes they just aren't into it.
thing is that for some people exercise can be a social thing... or sometimes a bit of a 'me time' thing. a lot of couples don't work out together. either because they value it as their time to socialize with other people... or their time to spend with themself doing what they want... sometimes people aren't all that results focused, too. they just want to do their thing and have some kind of 'maintenence' idea in mind.
maybe she doesn't want to give control of her exercise over to you...