My 12yo doesn't want to come to my place anymore

This has been eating at me for weeks ngl. My son used to be excited about his weekends with me but lately he's been making excuses or just sitting on his phone the whole time. I asked him what's up and he said "your apartment is boring and I don't have my friends there."

I get it - he's 12, he's got friends and activities, but my ex gets him during the week for all the school stuff and his sports team. When does he get to see me? I feel like I'm losing him and I don't know how to fix it without pressuring him. Any dads dealt with this?