Should I break up?

My boyfriend and I are both college students so we are struggling a bit financially. We went to mcdonalds for dinner last night and my boyfriend ordered us 2 water cups. When we went to the foundation drink station he put pop in his water cup. I haven’t been able to shake it since and I just feel like he’s a bad person/thief and I shouldn’t raise kids with someone like him. He hasn’t displayed behavior like this before and we have been together for 3 years. Should I break up?

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