Telling the truth is easier than lying, all rumor and myth to the contrary. Lies are a lot of work. They weigh you down and isolate you. Small lies get lonely and seek out bigger lies. Don't ask one lover to lie or keep secrets from others.
Secrets build walls and discourage intimacy.
Know the difference between privacy and secrecy. Resist the desire to tell someone what you think they want to hear or try to protect them. Especially do not feign affection. If you're not sure about love, say so. If your relationships are not a high priority in your life, let people know.