The 'responsible' thing to do IMO is go to that last session and have closure for both of you... T's have feelings too even though we aren't 'supposed' to worry about them.

I would also ask myself "have I found the healing I need/want or an I just leaving this option". If you have not found the healing you need/want then 1. I would ask T for referrals that would better meet those needs and/or 2. Make sure you replace therapy with something else that is healing for you. Even if it is something totally different like meditation or an exercise class.