Got invited to a party by a friend I used to flirt with. Should I go?

So, I got invited to a party by a friend, and am questioning the ethics of whether I should go or not, and whether its rude to my current partner.

Background:

Before I met my current partner, I dated around a lot. I also would flirt (directly) with guys that I liked or could see potential dating. I didn't really have any fear of consequences that could occur. One of the guys I flirted with, lets call him John Doe, has a lot of parties which is where I first met him. I initiated flirting with him (casual at first) but then down the road I brought up what I was looking for. At that point he was still very unsure of what he wanted, etc.

That was the extent of it. No sexting, nothing like that, but we did go to a gaming cafe, and when we chatted afterwards, I said it was a great date (which seemed to freak him out). I gave up, realizing that he just wanted to be friends. After that we stopped flirting, nothing ever happened and nothing will. This happened 7 months ago.

Fast forward to today: John and I are currently friends. Im not attracted to him like I was. We dont talk that often, but we sometimes see each other at events and just chat. He invited me to a party, and a majority of my friends will be there as we share a friend group. Would it be rude to my current partner if I go? (he doesn't know about the flirting/history between John and I)

Got invited to a party by a friend I used to flirt with. Should I go?
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