By the looks of relationships failing left, right and centre, it would appear that every guy out there has a problem being honest with his girl about wanting to end the relationship. One of the major problems is that an increasingly high number of men have started having affairs on the side. Most of the time, their girlfriends are devoted but clueless women who have NO idea their men have a chick on the side. But hey, trust is a two-way street. If you two are on a different page, talk it out with him. This is one of the more subtle signs he is seeing someone else that most women often skip.
11 RED-FLAG Signs He's Seeing (Or Leaving You For) Another Woman
16 Subtle Signs He is Talking to Someone Else
Of course, this varies person to person. He makes no mention of the future. His birthday is in a month, and every time you ask what he wants to do, he changes the subject. This is a big one. He blatantly checks out other women in public. He just physically turns around to watch that waitress walk away.
The point is: Not necessarily. You should make it clear if you are not okay with him seeing other people, or find out that he is, which then gives you permission to also date more than one person at once. You deserve better, and you know that.
It can feel like you got hit by a truck when you suddenly discover that the guy you were interested in is no longer interested in you. Everything seemed so fine before! You guys were on the same page about everything!