Your partner needs to seek help for this with a therapist.

There are underlying reasons as to why he is doing this in preference to a sexual relationship with you. Only he knows the answers and he needs to work with a therapist to sort it out.

You could both see a relationship counsellor too.

What you must not do is start to think this is somehow a reflection upon you and take it personally, and let it attack your self esteem or confidence. This is his problem and he needs to address it himself. He needs to take responsibility for his actions and seek help. You can explain to him the impact it is having on your relationship......without close intimacy between you both then there is no relationship.

This may have started as a healthy boost to his libido......however, it has turned into a very unhealthy addiction, that is clearly having a detrimental affect on your relationship.

Good luck with things......sending you a hug x