Did my girlfriend cheat on me?

My girlfriend never mentioned me on fb once in three years, She omitted me from a trip I drove her to. She made sure I posted all our pics on my fb? She told me she closed her fb account, but i found it, and that is where she met this guy Jarrod, and she hid him, and lied about it for a year and a half! She tells me they were just friends, and only talked about their kids. But when I saw him posting heart emojis on her profile pic, it messed my mind up! I asked her to stop "talking to him, or it's over, and she promised she would, but lied again, and didn't stop! And get this. In the beginning of our relationship, it was her idea to not talk to the opposite sex, but i found out she never stopped. Ladies, did she cheat on me? I know I sound pathetic, but i was in love with her, and wanted to believe she wouldn't cheat. I need to know!

Did my girlfriend cheat on me?
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