7. Talk to them
This is the best approach you can have when you want to know if your partner is being unfaithful or not. Just have an honest conversation with them and see how things are going. It doesn’t matter if they are really dating someone else or not; the fact that this worries you means something, and you need to discuss this as soon as possible.
Be blunt and address this problem. Things will probably be much better if you have a serious talk about this matter instead of trying to search for their online profiles and unmask them.
Every romantic relationship has its ups and downs, and you and your partner should work together if you want to make things better.
You should also check out: 5 Signs Your Partner Fantasizes About Somebody When They’re With You