Boyfriend lied about being on Grindr. Overreacting?

I found out he was on the app and it made me very uncomfortable. His profile stated he was "single" and "looking for now." I confronted him about it - he denied it. So I showed him a screen shot and called him out on his lie. Of course we argued but long story short he promised he wouldn't use it again. He said he was just there to make friends and nothing more - the status was just never changed since we were together.

I recently found out he was using Grindr again by going through his account activity on google. He would install it and delete it - I asked him about it and of course he denied it. After showing him the proof and voicing my concerns he admitted he was on there a few times just chatting or sharing pictures nothing more. He insists he has never cheated on me, but at this point how would I know? The trust is gone but I love him.

His age was changed and it was a new profile picture so I wouldn't be able to recolonize him if I were to go on the app to snoop - not that I have (my friend sent me the screenshot the first time I ever found out he was on the app). So that means he's really cheating right? Do I break-up? What do I do? Am I overreacting or not?