Blaine is a party boy who works in the family business, but I don't think he takes it too seriously. For appearances (at the request/insistence of his family?) he publicly dates women, who think he's straight, although he is out and privately has fun with with many different random men. Santana is his very close friend who likes to spend his money. Blaine meets Kurt, who is a college student, at the cafe/restaurant in which Kurt works and he's quickly smitten, I think he sends Kurt little gifts. Santana is suspicious of Kurt, thinking he's a gold-digger.
His most frequent female date learns that he's gay (possibly because Blaine's father is forcing an engagement?) and she becomes Blaine's ally in getting great at his job to prove some point to his family, so he can be taken seriously instead of just being bait for the daughters of his father's business partners (or something).
Lastly, I think Blaine has a dog.
Thanks for any help finding it.