Thomas, Gally and Newt had just found out a way to get through the walls of the WCKD to rescue Minho, but Thomas didn't want to go anymore because of Teresa

Newt:”Are you afraid your little girlfriend’s gonna get hurt? Hm? This has obviously never been just about rescuing Minho, has it?”

Thomas:”Wait, what are you talking about?”

Newt:”Teresa. She’s the reason Minho’s missing in the first place now we finally have an opportunity to get him back, you don’t want to because of her?”

But before Thomas could even say anything Newt grabbed him by the collar of his shirt and pushed him against the wall pressing him against it

Newt:”Don’t lie to me!

Thomas gasped and Newt realized what he just did slowly letting go of Thomas

Newt:”Sorry…sorry….”