Honestly, I would be more than worried if my boyfriend of 3 years started getting all crafty for a few reasons.
Reason # 1 - I would ask myself if he was bi or gay (sounds awful but this is what I would really think)?
Reason # 2 - I want a boyfriend, not another girlfriend.
Reason # 3 - If my boyfriend was really really good at crafting, as in much better than me, I might give up my crafting out of intimidation all together = which would be awful.
Reason # 4 - I like crafting for my own enjoyment and pleasure, and I couldn't care less if my boyfriend wasn't praising my every creation & if I do need praise or criticism, I just post on craftster.
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I hope this helps, and I hope you only do pinstriping because you think it's cool, not because your boyfriend does. This lesson, of not bending your personality and likes to match your significant other's, is one that took me a while to realize. I wasted so much time pretending to like music my ex-boyfriend(s) liked, or trying to make myself like video games, or baseball, I missed out on finding what I liked. I hope that helped...