How to reassure yourself that someone loves you?

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okay so I got to a rough end with my ex-girlfriend it's not like she was a bad person but the thing is it wasn't supposed to end like that, things ended because of some family issues she still likes me, and wishes me well I know so because if not with me, she's an amazing person I got over her a few months back and now I'm in another relationship the thing is I do know that my current one loves me too and she is the person I can trust but sometimes she does things that sync with what my ex did and it makes me recall if my current one will do the same because honestly I just can't see myself break down like that last time again I just don't want someone to hurt me like that again because it was the first time I got that attached with someone and now it seems like this is the same thing over again

How to reassure yourself that someone loves you?
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