My boyfriend sent "don't miss me too much" to his female friend. Are they just friends or something else? What should I do?

so they were texting and the girl had to go for school so they had to stop texting for a while and he said "don't miss me too much" to her. he said she's only a friend, even though they liked each other before, nothing happened. they used to call a lot until i put a stop to it. and i also told him about me being unhappy with that text and he said he sent it because he knows she wouldn't receive it any other way other than a friend way. he told me he will be careful next time. it just feels weird. is he cheating on me? what should i do?
Definitely something else
Could be just friends
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My boyfriend sent "don't miss me too much" to his female friend. Are they just friends or something else? What should I do?
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