My Gmail is signed in through the app on ex-boyfriend's phone I had my email signed in on the Gmail app on my boyfriend's phone who is now on the other side of the country.  I've asked him a couple times to disconnect it but recently checked out Google Play and there's a bunch of new apps connected to my account. (I don't have a smart  phone.) Is there a way to disconnect it remotely without access to his phone?

Second, I've recently been flooded with spam mail, which is unusual for me.  Could this be because of that connection?
Go to:

https://accounts.google.com/b/0/EditPasswd

and change your password, then go to:

https://security.google.com/settings/security/permissions

and revoke access to everything.