Cheating husband ?

Hi

I have seen fb messages between my husband and another women.

They are very flirtatious, with sexual emojis and saying goodnight and good morning beautiful. Nothing black and white about cheating but very vague and “I expect to hear from you tomorrow” so I think they are talking on other platforms.

Am I being paranoid? We have been going through slight rough patch since Christmas since the death of my Nan.