Speaking from experience you should do both if you can as this is what will set you apart.

This is simple

- Try not to have 1-0-1 meetings with him i.e. always have someone else there with you - make excuses to have that extra person there - also make sure they are trustworthy
- Report your discomfort to your boss/mentor/HR department - make them aware - also make sure you trust whoever it is you tell
- Put your mobile phone on record so your entire conversation is on record - don't let anyone know you are recording as you may get into trouble
- Never accept dinner invitations without your husband/third person present as it is unethical
- Make sure you don't accept any food/drinks - all it takes is a little pill and you will have no memory of what really happened

Also take courage this sort of behaviour will always happen- running away from the situation will only undermine your position in the company.

Don't quit - you are probably on probation. You might think you are doing badly and your boss may think you are doing ok.
Coding is not harder than physics. You need to use the online code forums that you are programming in - they will be a great resource to help you.

As Tina Turner said - what's love got to do with it? You dishonored her by getting her pregnant out of wedlock and then honored her by marrying her. Now you want to dishonor her again by not loving her! Dude you need to wake up! If this lady loves you as you say she does then you are throwing away a good thing and I can guarantee you life will not give you another! here's what you need to do

- Forget about SEX (for the moment)
- Bring a spark back into your marriage- find out what you both like to do and do it
- Make an effort to look good and also help her (don't criticize her looks) to feel and look better
- Go away for a few days, if you can get away for a long weekend then just do it and try to have a really good time
- Stop sleeping in separate bedrooms

And last but not least- you both need to GROW UP! and remember the God you serve

Good luck