Tks for the update!
He has learned to use you as his crutch to get to sleep. He is not a newborn, so you don't have those issues to deal with. Laura is right for how to deal with him first off. Sit down beside him ON THE FLOOR and put your hand through the slats of the crib and touch his leg, C.. If you sit in a chair or stand beside the crib, he will just stand up and cry, reaching out to you. If you sit in the floor, he will end up laying down in order to be closer to you.
Do it every single night until he is going to sleep fairly quickly. He might always cry a little, but that's okay. Once he has learned to SELF-SOOTHE (that's what it's called when a baby falls asleep on his own), then you can lay him down, say nighty-night and walk out of the room. It might take a while to get to that point.
If someone in the apartment complex asks why baby is crying at night, tell them that you are helping him learn not to sleep in mommy's bed and that you are with him in his room helping him. That way they will not think that you are abandoning baby.
You are doing the right thing - the longer you wait, the harder it is to get baby out of your bed. If you wait too long, he will start climbing out of the crib to get to you, and then you'll have to treat his ROOM as a crib. Or you'll end up with him in your bed until he's a very big boy.
Good luck,
Dawn