Is it considered cheating to want to jerk off to other girls? Girlfriend was sexting with me then left and went to sleep.

We were sexting but then she left and went to sleep so I just kind of got left being horny and I don’t wanna do anything wrong or that damages our relationship at all but i just got urges now and Im confused about my emotions, besides that ive done Nofap for 6 months so even that is seeming strange to me, horny thoughts came back because of how I’ve been with my girlfriend nowadays.