Reaching out to an ex?

My boyfriend of 5 years broke up with me about a week ago. We were planning on getting engaged soon and the circumstances seem like cold feet. We are on good communication terms and he said it is very possible we will get back together someday, he just wants to make sure he has no doubts. I read online to only communicate positively during this time to have him associate me with positive feelings instead of the negative feelings of the breakup. I’ve been looking at old pics of us having fun to reminisce. Should I casually send some to him? Should I pull back on communicating with him?
Reaching out to an ex?
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