I only brought up your girlfriend because, in our posts you mentioned that you missed not having the reinforcement and approval from someone in regard to your hobby. Then you mentioned that your ex-wife used to be that support for you and now.....ya know?
Like many people, I too have been in "slumps" before, and through some really smart advice, realized that the problem was NOT what I thought it was--it was, in fact, something completely outside of where I was looking. Or I should say 'where I was comfortable looking".
If you say it's not your your girlfriend, then I have no reason to try to convince you that it is, but while she may take you to hobby shops, I just want to offer the opinion that buying you something is not the same as making you feel some approval for it. If my girlfriend didn't appreciate my modeling, it would certainly make me wonder if somehow this hobby was some kind of source for tension in my relationship,, especially if she "hated when I brought it up" to paraphrase YOUR own words. You seem to be backing away from that statement now, but it's kinda interesting that you put it that way in the first mention of it before someone called you out on that particular comment?
Anyway, that's the last I'll say on it. I still think you should tell her exactly HOW much of an interest it is for you, and why it matters to you that she realizes that it's an important creative outlet for you.
I build my girlfriend models--two or three a year. Her favorite car, horse-themed stuff---even the famous Castle Neuschwanstein where we took a special holiday. Did you ever think of doing something like that to get her a little more "connected" t your love of the hobby? It also might provide some real inspiration for YOU to be working on something so personal and special for the person you love?