Is having sexual intercourse with someone other than your partner cheating? (scienceofrelationships.com)
There are arguments on both sides; one side you aren't touching anyone but then again you shouldn't be speaking about intimate issues with anyone other than your partner. (pillowspot.com)
To some, infidelity also includes secret thoughts about a person other than a partner or the development of an emotional connection outside the primary relationship. (goodtherapy.org)