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romance isn’t for show — his friends believe it’s the “real deal,” a source tells PEOPLE.

“Travis’ friends think this is the real deal for him,” the insider close to the Kansas City Chiefs star says exclusively. “They’re still a little shocked by all of it — that he’s dating the Taylor Swift, but they’ve seen how down to earth she is with his friends and family.”

The source adds that the relationship is “growing” because the NFL tight end, 34, and the music superstar, 33, both have found success in their own worlds — and they continue“They’re both really hard workers, and he acknowledges her art is hers, and he has what’s his,” the source tells PEOPLE. “He understands the territory their relationship comes with and like he said, isn’t letting any of the hoopla impact how they’re growing together.”The scrutiny she gets, how much she has a magnifying glass on her, every single day, paparazzi outside her house, outside every restaurant she goes to, after every flight she gets off, and she’s just living, enjoying life. When she acts like that I better not be the one acting all strange.”

He said that spending time getting to know Swift has been eye-opening, admitting, “I’ve never been a man of words. Being around her, seeing how smart Taylor is, has been f—ing mind-blowing. I’m learning every day.”