Boyfriend

So I’ve been confused about my boyfriend and don’t know what to do. We’ve been dating for more than a year and he’s a really good guy but I recently found out he was texting my sister on the low and unblocking her and blocking her when I was around. (My sister is a snake so I never liked her having my bf on social media) anyways, I read some of their conversation and it was a little suspicious. I didn’t find anything “too” bad it was just talk about me igs. Besides that, he never tells me anything and he knew I didn’t want him texting her. Idk what to do because I just want him to be open about everything and not to keep secrets. It really hurt and after I talked to him about it a few weeks later I seen that he texted two girls about something and he didn’t tell me. I feel like he’s hiding something but I looked and he grabbed his phone and double checked then let me read the convo. Idk, am i being too jealous that he was texting the girls? It was about “work” but idk how to talk to him about it? I just don’t want any secrets and it really hurt my feeling that he was texting my sister behind my back. Any advice? (Sorry kinda rambled on)