Gmail stuck on my ex-boyfriends android?

[Alysa]

Four months ago I signed into my gmail account from my then boyfriends android phone. I forgot to sign it out after checking it. He then (without me knowing) somehow connected his google account to mine and now I'm just realizing that in "Dashboard" it says "ANDROID DEVICE" and underneath it says "emails: (my email@gmail.com, his email@gmail.com). underneath that it says "Android market" And I can see everything he installs and even install things to his phone from the android market site. So anyways my question is.. How do I remove his android phone and google account so it isnt conected to my account anymore in anyway? I can't do it from his phone because we are not on friendly terms. I'm worried now he's going through my mail and what not and I feel sort of violated. This is the same ex that went into my Facebook after we broke up and messages horrible things to people on my friends list. I just want him to stay out of my personal business and life. And it seems as if google does not give me the option to remove him. : ( Please help? Thank you so so much

[Cristina]

complicated

[Joe Kunnummyalil]

Check if he is forwarding your emails to his email. Goto gmail->settings->forwarding. remove any email forwards.
Create a checkpoint in Facebook.(account settings->security->login notifications) it tells what device is entering your Facebook each time they login.
Create a two step verification process for google accounts. goto google accounts->two step verification
Change your secondary and recovery email from your gmail and google account .
goto https://market.android.com/account and update your device and cancel any other systems.