Fraser, 22, has caught the eye for the Cherries with some influential performances in his breakthrough Premier League season, earning him a contract extension this month.
"I was just a young boy back then (2013)," he told BBC Radio Solent. "I was a little bit shy, I didn't speak to the lads for a while, but now it's a big change."
The Scotland Under-21 winger singles out Howe for helping him grow up as both a player and person while on the south coast.
"He's helped me with my life, not just my football," Fraser said of his boss. "He's been more than just a manager.
"I need to pay him back for everything he's done for me. I love this club and he's a big part in me wanting to stay."