Deal is there are no guarantees. While rare, I have known people who were blindsided by the end of a relationship with zero clues or knowledge.
However, most of the time there are clues. You know when there are problems.
I don't see any here but your own insecurity. I wonder if he told you "I love you" several times a day if you wouldn't still question him. I think you may.
You cannot go through life with the assurances that no person will ever hurt you again. They will - it may not be him and I hope it is not, but it also may be him.
Your alternative is just to never be in a relationship again.
Or to know that there is always possibilities - but you will cross that bridge if it comes to it. Till then lay back and enjoy the ride!