I used to like Ty but really? Every time life gets hard Ty goes into the fight or flight mode. He's leaving Amy at 3 months pregnant to save Gobi bears in Mongolia? I clapped when Tim expressed his opinion at the dinner table which is how normal people would react. Ty has barely been a partner of Scott's clinic where he's still new at getting post graduate hands on experience which is much different than book work and HE'S the one compared to more seasoned vets to save the Gobi Bears in Mongolia along with Bob who already has proven to be a terrible decision maker ie: working with the poachers? If this duo is their last hope than there is little success for Vets without Borders.
The whole reason Ty chose to partner up with Scott instead of partnering up with Amy at the ranch is because they both said it would give him much needed experience.
Ty has ultimately always been about himself leaving Amy when he shouldn't. Example, after the 1st time he kissed Amy he took off alone and left her for 4 months to find his father. After he said he needed 3 weeks to find himself he took off alone and left her for 3 months and came back with Blair on the back of his motorcycle and his need to be alone without Amy turned into a road trip with Blair and Grant over Amy. When it was supposed to be his last day with Amy before he went off to university he chose instead to take off with Scott over Amy on a call and almost died in the plane crash. When he went to spread his dads ashes he told Amy he didn't want her with him but allowed Jack over Amy to share that moment with. When he went to see his mother when she relapsed drinking he told Amy he didn't want her with him and chose to deal with Wade over Amy. When situations arise where he should want the woman he professes to love to stand in solidarity with him to provide emotional support and tackle problems together as any normal couple instead he always wants to leave her to take off by himself or with someone else over her.
Vets without Borders had been in existence well before Amy was pregnant. He had years to join up for any number of causes but chooses now to do so? He should've done so when he was single. His priority now is to stay with Amy and the baby. If everyone left their pregnant wife because they wanted to devote themselves to a humanitarian mission and because they've "never felt so compelled so driven about anything about injustice" then no one would ever choose to stay and watch their wife gain weight, deal with pregnancy hormones, have morning sickness, be stressed out daily about the financial and emotional toll of raising a child etc. But Ty gets to go off and escape the stress of impending fatherhood and get away from it all (including a loss of income with a baby on the way and the need to still pay back his student debt) leaving Amy as the sole bread winner in her pregnant state for 4 months in the care of an aging grandfather, a father who doesn't live with her on-site, underaged girls who have no experience with caring for a pregnant woman, on a ranch that could use his help with Amy being perfectly fine with this. The writers went off the rails this time. Totally unbelievable!