Hello all 
So me and my ex boyfriend broke up just over a month ago after nearly 3 and a half years together. After doing NC the day after the break up, I didn’t break it once and worked on myself as best as I could, considering that my anxiety and depression did get the best of me some days and left me feeling low.
I came out of contact just under a week ago and took the plunge to contact my ex. Our normal line of contact was via Messenger so I used this to contact him. I sent a simple message asking for his advice on something and hoped hope all was well with him - and he replied within 2hrs with a positive response as well as asking how I was. I replied, then ended the conversation. I left it 2 days, then initiated a conversation regarding something amazing which had just happened. This got a reply in half an hour and we carried on a conversation (every hour or two) until the evening where I ended the conversation again.
I initiated another conversation (after leaving it 2 days again) this afternoon that had a small positive memory attached. He hasn’t read the message yet, but I have seen that he has been ‘active’ on facebook and messenger which leads me to believe he has seen that I’ve sent him a message.
I won’t deny that this is making me anxious that he hasn’t replied yet, considering that the past two conversations have gone positively so far. I haven’t once brought up the break-up or brought up anything regarding getting back together, even though this is still what I want - but i’m smart enough to know that I should never mention that until he is ready. I’ve also made sure my messages are not reflecting neediness too.
He hasn’t initiated any of the conversations over the past week, but he has replied well and positively to our conversations once they’re initiated. I’m just very confused with his current behaviour, as he’s replied every other time. I don’t know if I need to give him more time (even though it has been over 6hrs since I sent my message) or if he’s now just ignoring me 
Have I triggered a response inside him that’s making him ignore me?
I have been reading some articles (a bad idea when my anxiety is so high!) that have said that the reason he’s gone distant/cold is because he’s found another girl. I’d like to think that after nearly 3 and a half years together and just over 5 weeks since we broke up that he wouldn’t move on this soon - he even told me when he was breaking up with me that he really disliked like the idea of me finding another guy that would be my boyfriend!
I need some good solid advice as to what to do next. I’m not going to reply to his message until he does, but until then, if any of you have any ideas as to what could be going on in his head, it would help me so much!