I definitely think that you need to communicate with your boyfriend and friends like Alice suggested. However, two things that you said set off a red flag. It's not fair or rational for him to get mad at you for not spending enough time with him, in his opinion. You are your own person with your own life. School, work, and your existing friendships are all important to you, and he should respect that, especially because you are obviously making such an effort to find time for him.

You also mentioned that your friends weren't crazy about your boyfriend. You didn't exactly say whether or not your friends disliked your boyfriend, but I got the vibe that they didn't really hit it off. Maybe they don't think that he's a good person to have intimately in your life? You should really ask them and take your friends' concerns and feelings into consideration.