Me (21F) and my boyfriend (25M) are trying to open our relationship and we've been talking about trying things. Last Saturday he told me he was going on a date with this girl and I went out with some friends, but since the Sunday I've been very anxious. I went to his house yesterday and we talked about how we were feeling, while I was with him it felt really reassuring but seeing how things were placed in his room I realised he took her home with him. It's the first time I'm trying this in a relationship and I haven't been going on dates yet. How can I deal with this anxiety? I keep being scared of things changing, and sometimes it feels so overwhelming I can't think of anything else. It's also his first time so we're both insecure.