i will give you some other suggestion - do you feel he has moved on or there's someone else in the picture? think about it. if you said you've already tried everything, and i am sure you must have, then any sane guy would want to reciprocate at least once.
talk to him and be direct. ask him. and you'll be able to judge from his expression what's really going on. after that, the choice is yours. all the best and a big hug to you
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