should I be worried about my boyfriend?

my boyfriend and I have been going out for a little over a month. Last time I’ve seen him was two says ago in the morning and he hasn’t called me since. My friend just told me he saw him downtown walking with two hot girls and when he looked at my friend he didnt say hi and he looked scared. It was at six pm and I live downtown and he didnt even call me..so you think he’s seeing one of the girls?I called him twice today at one pm and he didnt answer and its nine now and he hasn’t called me back yet…and he always answers his phone I’d calls me right back.should I be worried? Should I call again or wait till he calls back?also we only see eacother at night like after ten pm because he works during the day…so what bothers me is he chose to any with those two girls on his day off instead of me his girlfriend. His profile is still single and mine I’s hidden should I say prove it to me I’m the only girl your seeing by outing in a relationship with me. Thanks for I’d help I appreciate any advice!