Just my opinion............I don't think you should fear a secure attachment, it is not necessary for everyone but if you are concerned about that then it is important to you. It takes time to build this up and trust your T, especially if you have a history of being hurt before(don't we all?) You have to be vulnerable which is tough........part of that is being honest, taking risks, and believing that your T is being truthful when he/she tells you what they think/feel(that they don't have an alternate agenda).
I think most people fear an attachment because of the unknown or pain associated with it. I understand that completely. However, with my last T, it was totally worth the pain I went through(and am still going through) to have that close, emotional, healing bond with another person. It's not all bad.....I hope that helps.