Should I go back to my Ex?

So 2 year my ex (then boyfriend) and I ended things silently we just went different ways without a word. At the time we start dating I was going through a heartbreak, which. he knew of. My feelings weren't strong for him, I had some hope my fiance (reason for heartbreak) and I could mend things and get married. my boyfriend at the time did not leave me but we carried on dating for the next 21 months we ended things without speaking about us. now he going through what I was going through, we recently met and he open up about he's dating problem and few troubles, he didn't say how he felt about me.
when I was in his position he was there for must of if for as much as I let him.
I don't know what to do, should I try rekindle things or just be there for him through this as friends.
I'm afraid that once the healing is done we might fall out love. should I call/text him.
Should I go back to my Ex?
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