Should I take him back?

His girlfriend brokeup with him so he came to me.. after that he brokeup with me and went back to her.

all i knew later that he wasn't serious about us at all, and he just wanted to tease her.

Now they brokeup again and he came back to me saying that he was stupid letting me go.

He's much diffrent than before.. he's asking about anything he would do to make it up for me.

He sayed i didn't know you well.. by the way they brokeup because of her.

Should i take him seriously this time or he might do this again and breakup with me to go to her?
Should I take him back?
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