Taylor Swift is addressing how she copes with “weird rumors” about her six-year-relationship. The Grammy winner discussed her upcoming album, “Midnights,” in an Instagram video posted early Friday, and the influence her long-term relationship with Joe Alwyn had on the first track, “Lavender Haze.” “I happened upon the phrase ‘lavender haze’ when I was watching ‘Mad Men.’ And I looked it up, because I thought it sounded cool,” Swift, 32, said in the clip. “And it turns out that it’s a common phrase used in the ‘50s where they would just describe being in love, like if you were in the lavender h…