Advice..? If possible...

Sorry if this isn’t the right spot to ask this but.. in a couple months it will make 2 yrs since I lost my fiancé... This week I signed up on a dating app.. I talked to a guy on there and felt completely horrible about it.. to the point I cried about it. I know my fiancé wouldn’t want me to feel this way... any tips on how to... not feel this way..