Why hasn't my ex contacted me? Should I try to contact him again?

wisdom3
Well my ex hasn't tried contacting me, it's been 6 months that we have been broken up. We were together for 2 years, last attempts of me trying was a phone call, didn't go anywhere. I have tried plenty and just stopped so it's been 3 months of no contact. Then I talked to him at a party and he said he thinks of me and misses me but he was drunk. He told me he changed his number and well I wish he would realize what he had and try to talk to me.. Should I try to reconnect?
Why hasn't my ex contacted me? Should I try to contact him again?
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