Not feeling as bad as I think I should

Samantha
Ok so I had something of "an arrangement"'with an older guy I first met when he was a client. It lasted for about 6 months. This isn't the first time a client became more than a regular. But it became clear he developed much stronger feelings for me than was ok for merely an arrangement and he showered me with gifts and financial help for various thing. But here's the thing. I never told him I would never ever feel the same way about him but I continued to take his money and gifts for several months. Well he eventually left. But it's clear he figured out I hadn't been truthful. I realize I hurt him but still feel like he was responsible for knowing who I was given the way we originally met. Anyone with any similar experiences? Do I seem like a terrible person???