Help?

I went out with this guy when we were 15 for like a month. He broke up with me and we haven’t spoken since then. Like at all. Complete ignoring even in group tasks and in class. Well this is going to sound kinda weird but last night I had this really hot dream about him, I woke up and my vagina was tingling and I was so horny that I had to masterbate. We didn’t even have sex in the dream we were just making out/ about to. Anyway, I now want to get in contact with him to maybe make my dream a reality. Is it a good idea to just message him? He’s always online and he’s online really late at night, maybe he might be lonely? I feel like he may be interested, I think he thinks I’m attractive. Idk what to say please help me