My now ex T teared up on a couple of occasions I think. Not that I would really know as I never used to make eye contact. I could probably count on my fingers and feet how many times our eyes met in 5 years, but every now and again she would say "I'm sorry, I just need a second". I can't imagine you upset her, as such, just that she felt emotional. Probably not upset tears, if that makes sense. I don't really fully get feelings, so maybe just ignore me, but I think sometimes people can be touched and get tears in their eyes. It sounds like that, to me. Like maybe she was seeing your pain and being empathic with that.
It meant a lot to me that I touched my T, so it wasn't an issue for me. That she cared meant a lot to me.