It's okay to feel what you're feeling. It's not easy, but this will pass (not be forgotten).

I had a similar problem transitioning from T6 to T7. T6 helped me find T7, they never knew each other. T7 was a rushed decision. I accepted her because I didn't have the energy to find someone else. Spent 2 years with T7...what a waste...

Be patient with yourself. Be honest with yourself. If something isn't working, don't settle for mediocre. You now know what a "good" T for you is. You will always have the lessons and memories from T1 and T2. Hold on to those...they are valuable and precious. And maybe you can ask T2 to remember her by: a stuffed animal, a letter, a photo, etc. And maybe she'd be willing to stay in contact?

I really feel for you. Lots of love and best wishes!