I want to tell my the guy i love how i feel

I have been in love with a guy for the last year and a half. We worked together and spoke for quite a while and got along really well and were close friends. The last time I saw him was 7 months ago when he left for another job and haven't seen him again since.

I started speaking to him again two months ago. I was missing him and I just was thinking of him, wanted to check in. It went really well. We kept the conversation going for those two months and I then decided to ask him if he wanted to catch up. He read the message and that is where the conversation ended.

I am gutted and do have my own thoughts about why he probably didn't respond, it could just be a multitude of different things. The thing is, I have the biggest crush on this guy. really liked him back then but I couldn't bring myself to tell him. It's getting to the point where I'm struggling to keep it to myself and I have no one else to tell or even ask about it. It probably isn't the best idea, but should I tell him how I feel and just get it out, or should I just forget about it all and try to move on?