Be with someone who would never make you feel like a failure but also someone who would go miles with you for your success as well. Going miles with you have nothing to do with doing your part of the work, but moving along with you while you do it for yourself. Also, expect such a partner only if you are willing to be That Person for them as well.
It is said that ambitious people have only two options- A supportive partner or No partner at all, and I can’t agree more.