Is he cheating?

naomi sapphy🌹 • keeping up with my body🌸

I think my boyfriend of nearly 2 years is cheating on me with somebody from work, I'm genuinely broken and I'm not sure if he is or if he likes her. He told me it was his sisters mate but his sister doesn't have her on Facebook and she literally has everyone on Facebook. She's been ringing him, texting him constantly. Saying things like 'you're so funny' 'why aren't you single' 'your gf is so lucky' 'ring me babe' 'are we all going out to this club or that club'.

I'm literally livid, I don't know if I'm just overreacting but I have trust issues because of past relationships and I'm nervous I'm losing him. Somebody, please help me 😓