The third reason

Panic started to etch on Abi's face. 

Tears pooled in her eyes again, glistening on her long dark lashes before they flowed endlessly. She shook her head at him like she was in denial.

She tried to open her lips but they just trembled. It was so hard to speak. She felt like she was choking for air.

"No, Alex. Y-you said you don't do love. You said you would never... fall in love… with anyone…" she stammered, her voice raw with both pain and disbelief. This was it, her greatest happiness and greatest fear.

No… he can't fall for her. He can't love her!

Alex smiled half a smile but his eyes became unbelievably tender.