Harbinger of Destiny by Tina Folsom

In 2085, humankind is at the brink of extinction. The only hope for survival is to send young men back in time to find fertile women and bring them back to the future.

Unceremoniously dumped by his beautiful and high-maintenance girlfriend in 2085, Joshua Fletcher signs up for the time-travel program. He hopes for an escape, thinking that things were easier in the good old days.
But 2025 is no walk in the park, at least not for Amy Brooks. After aging-out of the foster care system, she’s on her own. Making friends doesn’t come easy. She’s doing her best to keep afloat by working in a coffee shop, while attending community college. But secretly, she dreams of a better life and of finding love, yet knows that all she’ll ever receive is pity.

When she meets Joshua, who defends her in a precarious situation, she doesn’t know whether to trust him. He’s just too good to be true.