Can being a workaholic affect a relationship?

Yes. Definitely. Especially for people who are very much ambitious and involved in their work. Most of the time couples have different jobs in different industries so it's really hard to keep up with each other. At the same time it's not impossible for a couple like that to last. I know plenty of people who are happy and in love. It just takes more effort to make time for each other when your schedule clashes.