Im a 20 year old male who is in a very supporting happy relationship with my SO who i am strongly in love with for 8 months albeit there are bursts of time where i feel loveless for no significant reasons in tandem with intrusive thoughts of other attractive people that tell me I don't love them enough or I'm going to fuck up one day or that there's things i don't like about them which is far from the truth.

Can anyone relate or provide insight?