Boyfriend is lying about whereabouts, calls. What to do?!

Lilygreenrevolution
Hey guys, I will present my problem in the most objective way possible: my boyfriend (living together for 7 months now) during the past two weeks has been arriving much later from work than usual. He clocks out at 10:30pm every night, and it takes him 10-15 minutes to arrive home. He´s never arrived home later than 10:50 since we´ve lived together. For two weeks he´s been arriving at 11:30 at best, he says he´s been working late, but when I asked (after two weeks of this) if he was telling the truth, he got mad and wouldn´t talk to me, so I didn´t insist. In general we both go out with our friends (girls night-guys night out) and we text once or twice to let each other know where we´ll be, or if it looks like we´ll be out late. He had a party last night, didn´t call or text. I texted him at 01:30am asked if he was OK and how the party was. Never answered, so I tried calling at 2:00am, no answer. I woke up at 5:30am, still no call or text and tried to call him again, no answer. He arrived at 6:00am, and said he´d tried to call several times, but the calls didn´t go through. I checked his phone after he passed out and the call log only shows my missed calls, no outgoing calls to me. I shouldn´t have checked his pone, but I felt in my gut he wasn´t telling me the truth, and he isn´t. How should I take this, is this little lie covering up something bigger? How can I get him to tell me the truth?
Boyfriend is lying about whereabouts, calls. What to do?!
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