あなたをこんなに待たせて、すみません。

you (referring to someone of equal or lower status); dear (what a wife calls a husband)

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

so; like this; in this way

to wait; to await; to look forward to; to anticipate; to depend on; to need

excuse me; pardon me; I'm sorry; thank you