teen dating

I had suspicions that my 15 year old son was secretly dating a girl at his high school. the girl is a senior. when i asked him about it he denied any involvement. he has denied being involved with a girl one time before.

i went through his phone while he was not at home and i found text messages between him and the girl i was suspicious of. they said i love you to each other and the messages had brief sexual comments.

my son and i have a very close relationship and i don't want to ruin it by telling him i went through his phone, but he did lie and i don't know how to approach this. i am a single mom and i need help with this.