I am going to make the assumption that you the OP are a woman and your partner is a man. Gender-neutral language in English is an excessive strain.
noajthan wrote:Are you married or unmarried partners?
Had you acquired PR in UK before you left UK?
It's also relevant to ask if your partner has acquired PR. From your opening post, I think he has.
noajthan wrote:Your RC and continuity of residence in UK will be expired if you have been away from UK for over a year.
Your residence card will not have
expired; it remains 'valid' until it is
revoked or
expires, and I think it is unlikely to be revoked while you are outside the UK.
If your (=OP's) partner has permanent residence, then your residence card should not be revoked, for you are still entitled to reside with him in the UK.
If you are married, the card should get you two to the UK border, and you should then be admitted on the basis of your marriage - have your marriage certificate available. The card being revoked then should then matter little, for you will get an EEA Regulation stamp.
The rest of my reply assumes that you and your partner are not married and neither of you has permanent residence. (I haven't addressed the possibility of you having permanent residence - it seems unlikely from the date of your residence card.)
Your residence card may be revoked when you return to the UK on the grounds that your partner is no longer exercising treaty rights. Does he have leave of absence from his employment in the UK, or is he between jobs? If he has leave of absence, you may be able to argue that on return he is still exercising treaty rights.
You may be able to preserve your residence card by entering as a tourist, but the deception involved is illegal and may be held against you at a later date. Another, legal, preservation tactic would be to return after your partner has resumed work.
Another method would be to get a family permit, though I worry as to where your evidence of cohabitation is. It may not preserve your residence card, but I believe the current one will expire before you attain permanent residence.