i have a 5yr b1/b2 visa to america, i was here for 3months in dec2013 and met my fiancee who is a USC 5months later am back in the u.s but i was only

Hello. This may be possible.  Yes, you can process in the US, if you come with the intent of a tourist. If you enter with preconceived intent to file for your green card, you may be refused entry or ultimately denied based on your fraudulent entry. Therefore, you must handle your process carefully and within the bounds of discretion. However, you want to time this out appropriately so there are not issues. And, if you only got one month, I imagine your status is about to or has expired. Feel free to contact me if you want assistance.