Sacrificing your relationship for your career sounds noble and romantic from the outside, but the reality is that it can create a pattern of self-destruction that will ultimately burn you out on the career you've worked so hard to build. It's a trap, and for some, an easy way out of having to maintain relationships under stress.
Anyone who tells you "You have to be single to be a _______" is wrong.
One of Emily's tips: For every one thing you do for your career outside of normal, day-to-day tasks, do one thing for your relationship.
This is a good, concrete tip to help you keep track of who's winning--your career or your relationship. If you set up an evening meeting, make breakfast with your partner the next day. If you have to catch up on emails on a Saturday, do a household chore. It not only makes your partner feel valued, but it will help you to realize that making a meal with the person you love is just as important as any meeting--both are tasks that should make you feel fulfilled.
If you're aiming to keep both a relationship with a significant other and a life in comedy (or anything else really) afloat, it's worth a read.