Yes, things change after the passion is over and

The passion could last between 1 week to no more than 2 months. It is like you bought an iphone. You played with it every day for a few days then you prolly not as interested any more. It is not just him. It applies to humbanbeing. So to truly attract somebody you guy have to connect on both mental and physical level. If he and you are not in the same stage in life you guys would never cross. Dont take him to your company party. He has nothing to lose but meet more girls and tell other girls that you are his friend. You, on the other hand lost opportunity with other guys at the party.