<human>: Provide a brief overview of the text.

Sorry if this is the wrong board for this. I haven't been on reddit in a long time.

My girlfriend and I have been together for about six months and overall are very happy together. A couple weeks ago,she had talked about wanting to go to a strip club now that she's 18. I wasn't really comfortable with it but didn't want to say anything for not wanting to seem like the overbearing boyfriend who interferes with everything. 

A few days later, I was talking to an ex I'm still friends with who didn't know I was in a relationship and sent me explicit pictures. She said that I owed her something similar because of it and I got caught up in blind lust, sort of using the fact that my girlfriend wanted to go to a strip club to justify it. So I sent her some indecent pictures, then came to my senses and have felt terrible about it ever since. 

There are some upsides to it - in the past I've had trouble with wandering eyes, and this sort of made me realize how bad it is and woke me up. I have a new motivation to not let anything like it happen again. Also, I learned that I shouldn't judge my girlfriend for her sexuality like that. But regardless of the positives, I still feel extremely guilty and it's just been getting worse. I haven't been able to eat or keep food down when I try. I really care for her deeply and don't want to ruin things. But I feel like I need to tell her. What's the best thing to do?
<bot>: Got caught up in lust, sent explicit pictures to an ex girlfriend, and feel terrible about it. How do I explain it to my current girlfriend?