NateRiver wrote:
[...] I really don't want to do stuff with her [...]
I told her I think we should break [...]
Either of these two reasons are valid enough.
If you don't want to do stuff with her (regardless of what the stuff is, even model making)
and if the stuff is important to her (regardless if she says she'll stop, and it may not be fair to her to let her give that up)
then there's going to be hurt happening in this relationship to one or both of you.
Second, you seem to want to break it off. That's valid enough, staying in a relationship that is majorly unfun is... well unfun, the opposite of what the relationship should (on average) be.
You already said you think you should break, and that, in my opinion, is the answer to your question.
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(14.01.b) cogito ergo sum confusus