Long story short there is a guy im PLATONIC friends with and have been for awhile. We lowkey stopped talking for about a year bc we drifted apart into different groups. 3 weeks ago he snapped me and we havs been talking since then about random things like room decor or video games.He has a girlfriend who doesn't like him talking to other girls, even if its just friends. OUR ONLY CONNECTION IS JUST "SOMEONE TO TALK TO" THERE IS NO FEELINGS BETWEEN US which i wish his gf would understand. I didnt know this earlier and the guy and i have just been holding a streak for 3 weeks straight with us sending a snap atleast 4 times each hour. Ofc he hid our convos from his gf (which sucks a lot. I personally would hate to be in his gf's shoes.) his gf evetually found out and she was "cool" with it. So yeah things went on as normal until yesterday when i snapchatted him something and he opened but has left me on read for the past 26 hours. Should i contact him again or should i just let things be and not get involved with him any further bc i dont want to hurt his relationship?

Update: i didn't speak to him because i don't ever want to be the reason for someone else's breakup and he obviously had something going on for not replying. Thank you for all the advice.

Update #2: he talks to me in the hallways or between classes but when his gf comes around he stops talking to me. A couple times he has asked his other friends to tell me something bc he couldnt in front of his gf. Idk what i should do bc i think its harmless but i really dont want to hurt their relationship. Should i tell him to not talk to me again to help or should i just let it be and let him figure stuff between his gf?