Is it a bad idea for me to stay with my ex because I can't find anyone else?

It is difficult for me to find a long term relationship because not a lot of people understand me and it ends up not lasting. I don't know why because I try my best to act normal as I can. Therefore should I just settle with my ex if we wanted different things in our relationship?
Is it a bad idea for me to stay with my ex because I can't find anyone else?
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