The Love Hypothesis by Ali Hazelwood

Olive had no idea he was giving a talk, let alone when or
where, but she said “Of course! Can’t wait!” with the certainty
of someone who had installed a countdown widget on her
smartphone.
“And I’m staying with Adam, so I’ll see you at his place.”
Oh no. “Um . . .” She risked a glance at Adam, who was
unreadable. “Sure. Though we usually meet at my place,
so . . .”
“I see. You disapprove of his taxidermy collection, don’t
you?” Tom stood with a smirk. “Excuse me. I’ll get some
coffee and be right back.”
The second he was gone, Olive instantly turned to Adam.
Now that they were alone there were about ten million topics
for them to debrief on, but the only thing she could think of
was, “Do you really collect taxidermied animals?”
He gave her a scathing look and took his arm away from
around her shoulders. She felt cold all of a sudden. Bereft.
“I’m sorry. I had no idea he was your friend, or that you
two had a grant together. You do such different research, the
possibility didn’t even cross my mind.”
“You did mention that you don’t believe cancer researchers
can benefit from collaborating with computational modelists.”
“You—” She noticed the way his mouth was twitching and
wondered when exactly they’d gotten on teasing terms. “How
do you two know each other?”
“He was a postdoc in my lab, back when I was a Ph.D.
student. We’ve kept in touch and collaborated through the
years.”
So he must be four or five years older than Adam.
“You went to Harvard, right?”