<human>: My SO and I have been together for 3.5 years, and have been having problems for at least the past year and a half. I won't get too into the details, but one of our biggest issues right now is trust. He is having a hard time trusting me because of something I did. We were having a fight one weekend and decided to spend some time apart. I went to a birthday party for one of my classmates, whom my SO has never met, and ended up drinking too much and spending the night, despite my SOs attempts to pick me up and take me home. I slept on the couch, and there were other people there as well, and nothing happened. He is hurt/upset because it was a guys house and he has never  met this person. 

After the incident, he asked me not to speak with any of my male classmates outside of class anymore. I said I wouldn't, but then I texted one of them, and lied about it because I didn't want him to get mad at me. I was wrong to lie, and I know that. But it was all innocent, and I have done nothing unfaithful.

My question is, does anyone have any advice or exercises that will help us rebuild the trust in our relationship? We are also both seeing a therapist, but wanted to explore all of our avenues. Thanks in advance!

Can you condense the text into three sentences or less?
<bot>: SO is upset because I spent the night at a guys house after a party (slept on couch, nothing happened), and lied about texting friends from class. Advice on rebuilding trust needed.