Can I consider this as cheating, 27 M, please suggest something what should I do. 🙏🏼🙏🏼

Hi I am 27 M My gf 27 F was looking at somebody else while we were on a date, we've been dating for 3 years and I noticed she incident several times but this time on the same day she kept on looking at a guy and he was also looking at her. I noticed this thing 10-15 times. Both of them kept on doing the same thing and I felt very cornered at that time.... I feel like running out of the restaurant but somehow I managed to calm myself down. After doing all this when I confronted her she said I found him attractive to I checked him out and I looked at him only 2-3 times (though it was 8-9 times) & many more excuses. Can I consider this as audacity. need some suggestions and some honest reviews. Please help...🙏🏼🙏🏼