IPhone not receiving texts?

So I have an iPhone and my boyfriend has (i don't know all I know is it's not an iPhone lol) and so we were texting in the middle of a conversation and all of a sudden I don't hear from him for like 4 hours. Turns out he sent a text that I never received, and then later in the day it happened again. What is causing certain texts to not go through on my end?

Could be signal or glitches. Try removing sim card then put back in. Also reset network settings and reset apn. All these can help fix issue

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