Some say that he dates Lavender to make Hermione jealous, but given that he is a guy, he is completely oblivious to her feelings until she practically jumps him. He dates her because she likes him.
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In the sixth one he dated Lavender Brown, and in the last one Hermione.
Hermione Granger gets jealous of Lavender Brown dating Ron Weasley in Harry Potter and the Half-Blood Prince (the sixth book). Lavender Brown and Ron Weasley publicy show their affection in the Gryffindor Common Room and other places of Hogwarts.
Lavender Brown and Hermione Granger.
Lavender Brown dated Ron Weasley during their sixth year. It is unknown if she survived the final battle and therefore her future life is not known.
In HBP Lavender gave a Christmas-present to her boyfriend Ron Weasley: it was a necklace with the text from golden letters Sweetheart; Ron felt ashamed and rejected to wear the necklace :(