[slice_of_life]

Disclosure: haven't done this but I have a girlfriend of many years and a startup so here's my 2 cents.

Both these things are hard and as such both will have a hard time succeeding but they're both worth the trouble so I say go for it with these considerations:

You need to have an agreement that you will be professionals first while at work and that at work, work comes first. Your company is very important to you and emotions(good and bad) will tend to take precedence but you have to be cognizant of your emotions and try to separate them. You have to.

For this reason, have an agreement of sorts, a kin to a prenuptial agreement. Answer questions like if things go wrong and you can't work together anymore, what happens then? There's a reason companies have strict policy for workplace relationships and how they ought to be handled.