open relationship vs new kinky connection

Alright, I’ve recently entered an open relationship with my girlfriend of over a year. She’s wonderful, but she has zero kinkiness. I tried gradually bringing bondage into our bedroom life, but it didn’t go down well.

Then I met someone who seems perfect in every way. The night I brought her home, she practically jumped on me, pinned me down, and started biting me and doing other things. We talked later and found out she’s even more kinky than I could have imagined.

The catch is that she wants me all to herself; she doesn’t want him sharing me as she puts it with the girl in my open relationship.

Here’s my dilemma: Should I end things with the current girlfriend to start fresh with this new woman who seems so appealing right now? Or should I stay put with the partner of over a year?

I know ultimately it’s up to me, but I’d appreciate some neutral outside perspective because I don’t want to mess everything up and end up alone.