No definitive answer exists to this question as it is largely dependent on individual circumstances. Some people may consider emotional attachment outside of a committed relationship to be adultery, while others may not see it as such. It really depends on the level of commitment and intensity of emotions involved.
For example, if someone is in a committed relationship but begins developing strong feelings for someone else, they may be considered to be emotionally attached to that other person even if no physical contact has occurred. In this case, some people would view emotional attachment as a form of infidelity since it violates the monogamous agreement within the relationship.
Others may not see emotional attachment as adultery unless it leads to physical cheating. This could occur if the person acts on their feelings and pursues an affair with the other person. Even then, some people might still argue that emotional attachment alone isn’t technically adultery since there was no sexual contact involved.
Ultimately, whether or not emotional attachment is considered adultery is up to interpretation and personal opinion. What one person views as an act of infidelity, another may not see as such. It’s important to communicate openly with your partner about what you both consider to be cheating before any line is crossed.