Depends on what you need insurance for. Do you have small children? Are you dependent on each others' income?
Whole life is, for just about everyone, a terrible investment. If you would need to replace the income of the other person if he or you were to die tomorrow, or if you have children, then you should have a term life policy that will cover the lost income and have a policy in place for how ever long someone will be dependent on you. For parents of small children, policies of 20-25 years (or longer) make sense. At your age, a policy of this length would be expensive. If your kids are older and/or you would not need to replace the other person's income, then a shorter policy might make sense.
The goal of term life insurance is to never need to use it of course. That means that what you spend, you will never see and that's a good thing because you should be saving for college and retirement using tax-advantaged products designed specifically for those goals. So carefully define your needs and buy only a policy that covers the amount you need for the length of time that you need so that you don't spend more than you need to.
The other wrinkle is your marital status. Because you are not married, you'll need to take extra care when setting up beneficiaries, etc. Presumably you're on this board because at least you or your fiance has children, and as an unmarried couple if you are not the biological parents' of each others' child(ren) then you would not necessarily be the legal guardians in the case of one of you dying. If you both have children, it may make sense to consider setting up a trust that would be funded by a life insurance policy and then you can designate a trustee and set up specific parameters around who the money is to be used for and when. This keeps proceeds out of the hands of ex-spouses, bio-parents, etc. but ensures that your childrens' needs will be met.