My Exboyfriend Has Been Having Anxiety Attacks, They Started When

My exboyfriend has been having anxiety attacks, they started when we were lying in bed together every once in a while...as the relationship progress, per his requests, they got worse. To the point other things started to suffer and he pushed me away. We broken but when we talked about it over the phone for two hours he has the same feelings, and hadn't had an attack in a month. Most recently things were fine we were talked and hung out a couple of time, then he had an attack when we were cuddling. This time no pressure we were working on a friendship. Now is pushing me away again. How can someone who wanted a future, painted it, planned, it and told everyone I was the one. Have anxiety attacks talking about what happened or when we are close physically? He is blaming me, but it's somethINC else.