PLEASE HELP ME

My boyfriend and I haven’t spoken in two weeks. We are on a break. Not talking. Its a long story.

Anyway. The other night he messaged me and we just had a conversation about how school was going/what we have been up to. Maybe 15 mins into the conversation it started to drop off a bit and he stopped responding as quick as he was. Eventually he just opened my message and didnt reply back.

Im so fucking confused why he did this. Why start a conversation with me after two weeks and not saying a thing to me, and then just fuck off after not saying goodbye or goodnight or fuck all.

Has this happened to anyone? Any advice?