how to handle a dating 16 years od boy

(Kampala Uganda)

Happy New Year's Sara,
Now Sara, I have been a single mother indeed for 16 years now, & my boy has started dating a 15/14 years old gal, on 22/12 he asked me to go see his dad because he had holiday makers around which was a lie, he left on Tuesday & promised to be back after Christmas.

On the 31st he slept out & his dad sent messages which I took long to reply since he is another arrogant guy.

I kept calling other people at home but I was I getting different stories. When I called my son he said mum there no problem. I took action & went to his dad's office, Unfortunately, he explained to to me how my son was in a relationship & actually that's why he was there.

Now on Sunday the gal attacks my boy's father & confirmed how she loved my son but the father never said anything to gal yet, I thought that was the right time to talk to both of the kids.

Now he's telling me how he can't handle the boy who has just entered his life with such manner,
Sara, Am confused please advise on wayforward.