Should I stay on the app?

I met a guy recently on a dating app. We went on a few dates and he told me that he wanted to come off the app for me but he never deleted it. I decided that I would also stay off the app but recently after an argument I have seen him on the app. This means that everything he said to me was a lie.
Now I feel like I should be on the app as well and speaking to other people because he is probably talking to other girls. He is the only guy I am speaking to and I am afraid to start chatting to other guys cause they all usually just want to have sex and are not serious.

Another part of me feels like I should cut this guy off, delete the app and just be single so I can focus on myself despite being lonely.

What should I do?
Should I stay on the app?
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