If all of your "long term relationships" have failed, then it doesn't really matter how many of them you've had.
When a hook-up ends, did it "fail"? No; I got what I wanted out of it, namely sex. Similarly, when a long-term relationship ends, it hasn't "failed," because I got what I wanted out of it, namely emotional support and a meaningful relationship for an extended period.
To pretend that all relationships aim at marriage is an outdated ideal.
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Houston Texans: 5-3
If you have to put it in one word, it's lackofexecution.-- Ravens H.C. on loss to Jags