Bellatrix attended Hogwarts School of Witchcraft and Wizardry and was sorted into the Slytherin House. She eventually married Rodolphus Lestrange — a fellow pure-blood, as was expected of her — and when Lord Voldemort first rose to power, she and her husband joined the Death Eaters. Unlike her sisters, Bellatrix displayed no outward affection for her husband whatsoever, never even mentioning him in conversation. Her true love was Voldemort, who gave her some training in the Dark Arts, which contributed to her incredible talent as a duelist.I think because she was in love with him,because she was a pure-blood witch purposed to serve in Dark Arts.

Her whole family were Pure-Blood fanatics and opposed others who they thought were below them: half bloods, muggleborns, squibs, blood traitors.

I think its what Bellatrix was taught from a child, being Pure-Blood was everything to the Black Family, respectable lineage and marriage which was expected from her.

In her eyes being a Death Eater would be great, she loved Voldemorte even though i doubt he even returned her feelings (which is impossible as he cant love) and he taught her ruthlessness, deadly combatant, she had this "fear me" about her.

Because Bellatrix came from Slytherin!

From what i understand bellatrix was in tom riddle's inner circle in school so when he rose to power she was in love with him and joined like most of the others in that group

because she is mahoosivly cool and who wouldnt? there sooooo cool!!!!! and she also killed loads of people which also is cool yes i am a physco. stay away from me. AHHHHAHAHAAAAA!!! "evil laughter"

That's a tough question. But i think everyone is right. she was a Slytherin and she fell in love with the Dark Lord. I think she wanted to prove herself worthy of him.

Bellatrix went to hogwarts and became a slytherin. When she grew up she married Rodolphus lestrange who was already a death eater.she became a death eater and realized she had a stronger affection for voldemort.After that she dovoted her life as a death eater just to please him.

Because she basicaly loves Voldemort so yeah be a Death Eater your closer to him.