Does your partner use online dating apps?

So, the girl i'm dating has been using online dating apps such as OKCupid, and Tinder.

She was heart broken a year ago, started using it, then i came into her life (not from there) and she told me she stopped, but secretly still uses them all. She tells me she has 'friends' on there.

I explained to her that its an app for hooking up, and i don't feel comfortable about it, especially after she lied about not using it.

I feel that she finds more joy in those apps that me. She was more interested in talking to guys on those apps that she even forgot to collect my burger for me when i was busy trying to buy a cake for her to eat.

She's told me she don't use it anymore, but clearly she uses it. I know it, i've seen her use it, i just decide to put my trust in her, but i feel like its just too much. I'm tired of feeling disappointed and getting upset about this.

Please advice.

Thank you