I could have written most of this myself. I feel the same way about my T as you do. I told my T that I loved her and it just made my attachment more intense to the point where I feel like I was borderline obsessed with her. (Not in a lifetime movie kind of way thought) I had an emergency session due to a crisis I was having and I said it to her again and she said "I love you" back to me. That was one of the best feelings/moments of my life. I could tell she meant it and she felt the same way. She won't say it directly to me unless I am in crisis because she says its more reserved for her personal life. So we both decided to say "I have love for you" often. Its like our own special way to say it. Maybe if you tell your T that you love her if she is not comfortable saying it back maybe you both could compromise and say it in a non direct way.