The loan wasn't offered, the ADB only said they were willing to give a loan if the project goes ahead.
A bridge built on loans will not counter Chinese investments like the Port City
US doesn't need India here. Ties with SL are growing fast
US Wants to Make Lanka an Economic and Security Hub -The New Indian Express
South and Central Asia: Remarks at the Lakshman Kadirgamar Institute of International Relations and Strategic Studies - EIN News
Sri Lanka : US Under Secretary calls on Sri Lanka\'s PM
The first US, Sri Lanka Partnership Dialogue will be held in 2016 which will discuss Governance, Development Cooperation and People-to-People ties; Economic Cooperation; Security Cooperation; and International and Regional Affairs
US, Sri Lanka Partnership Dialogue to meet Feb 2016 in Washington | Lanka Business Online
Sri Lanka is currently studiying the Cons and Pros of the Trans Pacific Partnership and have already expressed interest in joining the second rounds of talks on joining TPP to John Kerry
That is what an offer a loan looks like.
The very fact that the loan was offered and here is an american trying to explain to India why we should take that loan tells a different story.
US is building an asian alliance against china so US will engage with SL to and India has encouraged it to dilute chinese influence. I don't see the problem as long as SL do not sign up for NATO