Bf is out of jail and acting differently CHEATING

Okay so recently I talked about my boyfriend going to jail and they extended his stay but last night they let him go. So I was really happy about that but when he called me he was upset with me bc I didn’t text his phone whenever he was in jail. Which I wrote him letters and I didn’t really understand why I needed to text his phone when I knew he wasn’t going to respond until he got out. So last night he was telling me that I needed to do better or what ever and he compared me to some girl that messaged him ever day until he got out she was saying stuff like I miss you and on the last day she was like today is the day you are suppose to get out I miss you so much. So I took offense to that and it made me feel like shit bc that should have been me saying that stuff and he was like yeah that should have been you I expected that out of you not her. He was like it’s the little things that I have to tell you to do. He responded to her saying that put a smile on my face I miss you too and she put the damn heart eyes. I’m afraid that he is cheating on me or something with her and I won’t actually she him until this weekend and I’m freaking out bc I feel like I have competition which he said I don’t bc I’m the only one he talks to but it doesn’t seem that way right now even tho we talk on the phone all the time but I’m not really the jealous type and he keeps telling me that I don’t give a fuck about him bc I don’t act like her maybe I’m just freaking out. do you guys think that this is cheating?