His name is Snape.
Well, the books are quite misleading and you don't find out until the near-end but yes ("Sanpe") Snape is on Dumbledore's side
Definitely not. Bellatrix hates Snape and is suspicious of his loyalty to Voldemort. Plus he is a lowly half-blood.
No.
Professor Snape is single
Professor Snape is single.
Hopefully not.
Do you mean DOES? Because the answer to the is no. Professor Snape really never tells Harry, but Harry sees Snape's memories and figures it out. This, of course, is after Snape was killed.
No, why would he be doing that? Plus he is dead.
No, they work on opposite sides. Bellatrix Lestrange works for Voldemort, Snape works for Dumbledore / for the Order of the Phoenix, that is, for the anti-Voldemort movement.
Well, the books are quite misleading and you don't find out until the near-end but yes ("Sanpe") Snape is on Dumbledore's side
He acts like he's a deatheater, but he's really working for the order.
Definitely not. Bellatrix hates Snape and is suspicious of his loyalty to Voldemort. Plus he is a lowly half-blood.
Snape follows Lord Voldemort because he needs to know what he is up to so he can report to the portrait of Dumbledore, hanging in his office.
No.
It is 'Snape', and no, he is not.