Will it be cheating on her?

So here's the deal, I'm at the point where I should buy another vehicle I'm getting close to retiring and my income is going to drop. My 204 Durango has been awesome I mean a great truck 4.7 SLT it's getting close to 120,000 miles still runs great and very clean but I feel it's time to make a move. I'm kind of thinking about a very nice Dodge Challenger but I feel like I may lose some passion for the 340 swinger if I go modern muscle I've always been a faithful kind of guy and it just feels weird.