When someone is nice to you only because they need a favor or because they want something, we can say any of the following things about them.
he's using me
he has an agenda (he's pushing his agenda)
he's a fair-weather friend
he's an opportunist / he's opportunistic
he's self-serving / self-centered / selfish
he's on the move (on the make)
he's only looking out for number one (himself)
he's a scheming individual (a schemer) / shifty individual / shady individual
she's a gold-digger (said of a woman who marries only for money)
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