I need some advice...

I've been in a relationship with this guy for 2 months now. I'm 19.. my boyfriend is 22.. We tell each other we love each other etc. We have nothing in common it makes me loose interest but I still care for this guy and I want him in my life. We are very new so I'm still trying to figure out this guy who I call my boyfriend.

But before we got together. I had deeper connection with a guy who is a lot older than me he's 35... we are best friends who I caught feelings for and still that feeling is there while I'm with someone else. Yesterday I was with my best friend without my boyfriend really knowing but he obviously knew because of what I put on Snapchat and it's so hard to keep my friendship going because knowing my boyfriend will get jealous and knowing me being stupid not messaging my boyfriend for like 5 hours and he was worried on why I wasn't replying and I have no idea how to make it sound appropriate.

I just really feel alone and don't have the words to explain and I need advice...