is it difficult to be trust again?

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i was disappointed three times since high school.my relationship never go far beyond 2 years.i want have a girlfriend and marry but i like certain type only,not just anygirl.i fed up and never feel like want a girl anymore.i feel like been betrayed and afraid frust again.every time i wanna start new relation they already have a boyfried?is it all beautiful ladies now days are not for single man like me? ......