I'm a wreck again

So my ex and I were together for almost a year and I was completely in love with him..he broke up with me 2 and 1/2 weeks before our anniversary and the day before he left on vaca for a month

I was a wreck when he left and I told him the day after how much I loved him and how much this hurts and all he had to say was that he felt like it was "going towards a wall" ...

Flash forward to almost 3 months later after not speaking to him at all

I was doing ok, better than before..

But then he hit me up

Just to ask me if I was already dating someone and if we were getting touchy....

He said that "he doesn't care if its true but it would just change his behaviour.....

What does that even mean????

The day after I was with a friend and I saw him pass right beside me without saying a word

...he can talk to me online apparently but can't even look at me in real life!!!

anyway now I'm a wreck again :((