Am I a fraud?

[AdamOua]

I met this new girl, and I already love her so much. However, I recently ended my previous relationship to be with her. Now, I'm unsure whether I should tell her about it. I made a promise to be honest when I entered this new relationship, but I can't help feeling like a fraud. I've been pretending that she was the only girl I was interested in, when in reality, I was swiping right on almost anyone with a pretty face on Tinder. Should I confess my past actions to her?
Like... I want to be honest with her, but I feel like a complete fuckboy, and I don't want her to overthink things.