Why doesn't he initiate text/calls?

gaiarose
So I've been dating this guy for almost a month now, and admittedly things were moving a bit too fast for both of us - He has already said "I love you", he introduced me to his best friend, and we had sex a couple of times. We started off as a hookup/fling which I am not proud of, but that is how we both were used to - so this dating thing seems new and foreign to me. We usually meet up once a week, and we would just call each other on that day and that's it - really casual as we don't text/ contact each other at all on other days of week. I thought that this is normal until recently, my friend (who's in a serious relationship) points out that what we are doing is not right - he never initiates texts/calls, which is a major red flag. She said that he's probably using me for sex, because he is not interested in carrying on daily conversations with me/knowing more about my life. I see that she does have a point, and got confused. Is not texting/calling at all a red flag? I usually am the one who would text/call him, and he always sound happy and excited on the phone. Should I stop contacting him to wait for him to take the initiative from now on?
Why doesn't he initiate text/calls?
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