I'm thinking about being obsessed with someone else while I'm married
Why do you need to shift your focus to someone else?
I think about it because I'm bored
It's not okay to be obsessed with someone else over your spouse. Your spouse may feel betrayed or that you don't care about them enough. They could grow to resent you.
I'm fine with any reaction.
You may be fine with it, but I think that your spouse is going to find it a little hurtful. You should not obsess over someone like that if it is not your spouse.