Is he thinking of cheating?

Me and my boyfriend have been together now for two and a bit years, in the last 3 weeks he has been constantly speaking to a girl in the year below him at uni, supposedly giving her advice for her dissertation next year. While he was out I saw the conversations they had been having, well of what parts he hadn't deleted, and they were very flirtatious. Talking about how she needed comforting and trying to win him over with puppy dog eyes, to which he responded well they won't work unless I could see them. Talking about how meeting up, talking about things he likes like certain games to get his attention. I know the girl in question had just broken up with her ex 2 weeks ago and now is flirting in a manner I feel uncomfortable with towards my boyfriend. I don't know whether I should be concerned that he would cheat on me, because the conversation seemed very flirty from both parties, or am I being stupid. He talks to her every day, ignoring me for her, if we spend the night together he will message her goodnight and good morning as soon as he goes to bed and as soon as he wakes up, but never to me, as he rarely talks to me when we aren't spending time together. Then he will hide his phone out of my eyesight when he talks to her. I can't talk to him about it. If I do he will just get angry and accuse me of onto trusting him and tell me that there is no point in our relationship if I don't trust he won't cheat on me. I fully agree that a relationship cannot work without trust, and I do but this conversation that is ongoing between them every day is making me nervous and paranoid. please help

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