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"Selling the OC" star Tyler Stanaland just popped up married, announcing his elopement -- and his former flame Alex Hall tells us she's happy for him ... she just hopes he's changed.

Alex told TMZ ... "I genuinely want nothing but the best for him and want him to find happiness, and it seems like he has."

Alex said, "To an outside perspective, people might be thinking sirens are going off because of his elopement. But I'm not here to judge because I also have done crazy things and am spontaneous. I just hope she doesn't get hurt by him and that he isn't repeating old patterns like he did with his ex-wife and with me." Getty

ICYMI ... when the reality show first started, Tyler was married to actress Brittany Snow , but some viewers felt he was entirely too flirty with

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