should i try and talk to him?

so my ex left about eight months ago (we were together for four) and i still think about him and miss him all the time. i still would jump at the chance to get back with him and i even dreamt about him last night. the girl he was with for a bit after me blocked me on all social media and now that they’re single i’ve been really thinking about reaching out to him, i’m just not sure if i should or how. i’m talking to someone else now who is mildly aware of these feelings, and im afraid i’ll try to message him and find out my number has been blocked. any advice? should i try and get in contact with him?