It really depends what your goals in life are. If you're like me, and at some point want to have sex with many very beautiful women (before maybe getting married at some later point) then being single pushes me to work extra hard. I know that in order to have relationships, encounters and just a great time with high-quality, intelligent and good looking women, you need to be on the top of your game. And I believe the more successful you are in your business, the more witty you'll become, the more confident etc. In fact I think these things are correlated; You'll be more successful business-wise if you are more confident and have better social skills.

So I think you need to figure out what you really want in life. (Wealth, Abundance of hot women, Fame, spiritual fulfillment, intellectual fulfillment, friends etc). Then do the things that in the LONG TERM will bring you those things.

A working relationship can be one the best things that ever happened to you; maybe that's worth being financially successful one or two years later.