According to my closest friends I have been openly hit on on several occasions and was completely oblivious to it...so as an aging but happy bachelor... DON'T BE OBLIVIOUS.... Pay attention to the little things conversation small moments..it will show you care because if you don't ....it is an easy signal to see how far a relationship can go especially at the start... And it goes for both parties..... A long-term relationship involves knowing each other especially a serious relationship... And I'm not talking about research that's creepy... just experience life together and you will learn together and those shared things build a bond The rest is time