Why do I always think my girlfriend is cheating?

I don't know. You have to trust the one you love and if you can't then you don't really have anything to begin with. Try to understand better if it is you or her that is going crazy and make sure you relax and just live and let live

This is anxiety. If you do not have a specific reason, that is, and even if you do really. Access your anxiety and/or perhaps speak to a doctor about it.

Maybe you have got trust issues? have you had any past issues with relationships? Is there any indication that might lead your suspects

It can be hard to feel secure in a relationship. This can result from a lack of trust, connection, or communication. Maybe you could feel more assured if you talked it through with your partner. It could also be that you are jealous of someone she hangs out or spends a lot of time with.

Maybe you are just insecure about the relationship in general or a little paranoid because of other reasons.

There could be deep issues here. I don't know. What makes you feel that your girlfriend might be cheating on you? How long have you feared this?

Basically u don't trust her. It may be because of your previous experiences or it may be because you afraid to loss her or she is not suitable for u.

There are many reasons there are and they can interfere one possible thing is that your girl friend is flirty or just say random things that might make you very jealous & you already very jealous also maybe because you have had experience of your girlfriend cheating on you before so you are afraid of cheating again it's normal just try to explain that to your partner & keep her informed of what's triggering these doubts it would great if she can understand then things will get better

We all deal with thinking too much and jumping to conclusions and we're all scared too. Mostly of the fact of being cheated on. Just don't worry and if things don't work out, don't worry, there's someone else there better for you that'll make you the happiest than you've ever been and that'll treat you right.

You could talk to her about it, maybe find the reason for your trust issues. You could also talk to some of your or her friends about it.