If you are financially able to buy and this is the area that you want to live in, then I say buy! Houses are really cheap right not and there is still a homebuyers tax credit out there. It is cheaper to buy and you will be building equity into the house. The future can change and you never know what it will bring so you don't know when your fiance is going to inherit the farm. If he ended up inheriting it early or you decided to move to him, you can always rent your place out. You already know that renting is more expensive so you would most likely make all your money back each month with a renter.
I wrote the above paragraph before reading a lot of the other answers and after I read them, I wanted to add this piece. A lot of the other answers seem very negative. First of all, I don't think that adding "ing" to your verbs changes what any of us know that you mean. I think that it is ridiculous that people are critizing your grammer when this is supposed to be a forum for help. (sorry just had to put that in there).
Anyways, I'm not sure if you have just started thinking or if you have truly started the process but I disagree that every home buyer absolutely knows. There are a lot of questions when it is your first home. It is very important to do your research and it might seem daunting at first, but if you put in the time and effort, you will figure it out. Yes, when you rent, the landlord will fix things that break, so you don't have that expense but if a mortgage would be significantly cheaper each month, then you can save some of the difference for house repairs that might come up. Also, if you look into townhouses, then you won't be responsible for any of the outside maintenace (although you pay an association fee for this so you should make sure to add that into your monthly mortgage fee).
I would agree that talking to a lender is the first step. They can discuss the different types of mortgages out there and they can help see what you qualify for based on income, credit etc. Having a pre-approval letter helps you know what you can afford and also makes you more appealable to sellers because they know you have the financing taken care of.
If you don't have a lot of money saved up, there are first-time homebuyer programs out there (depending on the city) that you might qualify for.
Buying a home is a very large step but that shouldn't scare you away. If it is truly what you want, then you can figure it out. Email me privately if you have any other questions and I can try to answer them for you.
Good luck with your decision.