My husband looked at another girl, is he cheating?
It is possible for a man to look at another woman and have sexual interest or feelings toward her. But that doesn't necessarily equal cheating. Every man isn't going to act on a look. He will appreciate but not sexually engage.
You know your husband. Is he a reckless man that would go outside of his marriage and destroy your relationship? Does he care about you? Is he completely committed to your wedding vows?
On the other hand, merely looking at another woman doesn't reveal your husband's heart and true intentions towards the other woman. He could simply be looking at her without it being anything further.
I suggest that you speak to your husband and find out if he is cheating.
I don't know what's going on in your relationship. You might be seeing something that's not there? Maybe he is cheating?
But only you can discover what's going on with your husband.
I hate to say this, but I must let you know. If you don't receive an answer from your husband that's satisfactory, it might be best to end the relationship.
You don't want to open your body to sexually transmitted diseases and the mental/emotional pain and trauma that come from staying in a marriage with a possibly cheating spouse.
At the same time, couple's counseling might be an option.
Use real people in your life to help provide guidance.
Finally, if you believe something is wrong, usually something is amiss.