“I’m not looking for a relationship right now.” does not mean anything other than that. You see, I’m not looking for a rock, but when I’ll come across a diamond I’ll certainly keep it. When I come across a dusty pebble, I’ll toss it away. If I tell you I’m not looking for a relationship, it means you’re the pebble. If you think you’re secretly a diamond, you can keep trying, but don’t be surprised if I don’t keep you.
ps: Looking for a relationship is what I avoid doing at all times.