Search Results: engaged and flirting

Me and my boyfriend been together for 2 years
He has told me his password to his laptop, tablet and phone from the beginning until 2 weeks ago

2 weeks ago, when he was in the shower, I went on his phone and looked at his facebook messenger and saw his messages to his friends
The only people he talks to are his coworkers (male and female) and his guy friends
The female coworkers are mostly married or have boyfriend and they talk about work or their family

I didn't see any flirting messages to any girls
But he does talk to his guy friends about "hot girls" at the gym
All his guy friends are married or engaged
So anyway I confronted him about it and so he knows I've been snooping around his phone and got mad at me for invading his privacy
And then he immediately changed his password to his phone and now he always brings his phone to the bathroom when he goes for shower , etc
He said he doesn't trust me with his phone anymore

Does this mean he's cheating on me?
Does this mean he's probably talking and flirting with other girls now?

Is focused mostly on career.
Never dated, never had sex, never been in a relationship.
Doesn't flirt, doesn't do stupid things like nudes and sexting, etc.
Doesn't talk to strangers easily in real life.
Doesn't have many friends, just 2 or 3.
Is introverted, is calm, is shy.
Is vegetarian, is a cat person, comes from a very religious family.
Would never engage in sex without an emotional connection (like one night stands, etc.), would never have threesomes.
Would never drink, never smoke, never take drugs (except for health reasons), would never go to strip clubs, bars, etc.
Would never swear, and say words like sh*t, etc.