"And, after just a couple months, the passion dies? What kind of commitment does that show?"

You ever break up with a girl because you just couldn't bring yourself to want to be with her even though you and all your friends agree that she (on the outside) feels like the perfect girl for you? How long could you talk yourself into staying with her for the sake of commitment? 50%+ of marriages end before the "death do us part" part. ;-)

Commitment is hard, and it's hard to talk yourself into doing a startup you no longer love when you can't bring yourself to WANT to. You owe it to your partners and customers to stick through low spots to see if you can beat the funk, but you don't owe anyone beyond that.