Guys, if you are casually dating someone and go on a date with another girl, that means?

Anonymous
We completely act like a couple. I guess I will first of all start out by explaining why he said he's not ready for a relationship. He still has feelings for his ex (broke up with her almost a year ago though and has dated someone else since).

We're LD for the summer (in college, me 19, him 21). He talks to me every night he can though, I just got back from spending the week at his place, he drove me home cause he didn't want me to have to be on a 3 hour train ride. He was willing to stay at my house and meet the fam, invited me to go on vaca with him and his fam. Buys me dinner, always compliments me. I have met his close friends, etc..We do have sex (as of recently when I spent the week with him last week.. he hasn't changed though). He has told me "if things work out well this summer, we can maybe try something".He confides everything to me, worries about me, etc..

The issue is, I just found out that he took a girl out to dinner the other night and danced with her and they had a really nice night together..but she turned out to be “a crazy stalker.” I’m not worried about the girl, he clearly doesn’t want anything to do with her.. I am just worried that he’s dating others.. I know he’s allowed to but still, doesn’t that mean he really doesn’t like me that much? He didn’t kiss her or anything. I just don’t know what to do.. I was good and just joked about it when he told me.. cause I don’t want to seem like I’m so pressuring for him to be an actual bf.. but at the same time I don’t want him to think he can do anything and I’ll still be there. This is the first date he has go on since meeting me.

I just know that he went on one date with her.. he hasn't dated anyone else.. I'm just worried that if she wasn't a psycho.. would he still be seeing her? He said they had been texting for awhile but just had a date for the 1st recently.

I'm the only one he will have sex with.. and I know that he likes me.. but at the same time.. how much can he like me if he goes on a date with her? Am I just being over thoughtful since I knew he only wanted to casual date?
Guys, if you are casually dating someone and go on a date with another girl, that means?
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