"Tyler and Stassi are absolutely hooking up. They are keeping things casual, but Tyler really likes Stassi," a source close to The Bachelorette's Season 15 contestant toldUs Weekly. "And he thinks she's gorgeous."
Although Tyler, 26, recently moved from Florida to New York City, he has been spending a lot of time in Los Angeles, CA, with Anastasia and her pals.
"He wants to continue seeing her and see where it goes," the source said of Tyler and the social-media influencer.
Tyler and Anastasia, 22, sparked dating rumors late last week when they were spotted together at a bar called Hyde in West Hollywood, CA, where Tyler was filmed holding and kissing the beautiful blonde as they chatted over cocktails.
And then on Monday, Tyler and Anastasia were linked again at the Los Angeles Rams vs. Baltimore Ravens game at L.A. Memorial Coliseum, after which they headed to a nightclub called Poppy together, along with Kylie.
Tyler, however, initially attended the NFL football game with his The Bachelorette pals Dylan Barbour and Peter Weber -- who's going to be starring on The Bachelor's 24th season -- while Anastasia apparently went to the game with girlfriends including Kylie and Kendall Jenner.
After a night of dancing and flirting at Poppy, TMZ reported Tyler and Anastasia left the club together at around 2AM.
The pair reportedly exited through a back door and then hopped into the backseat of a car together, while Kylie left separately.
While the Us source said Tyler is interested in seeing where things go with Anastasia, a different insider toldPeople what's happening between them "is just a fling."
"Tyler is focused on his career and business opportunities, he's not in a place where he's looking for love," the insider said. "He just moved to New York and is enjoying his single life."