Talking to your T about it won't make the thoughts or feeling go away.

If your T is a good one, then it will help take the negativity out of the feelings.

For example, your T may help you see that it's ok to be attached. Your T may help you understand why it's happening and begin to feel comfortable with the feelings so you can be comfortable with them in other relationships too.

It won't make it go away, but in my experience it can help you feel less distressed about it.