Hello "Manish". I am really sorry that you are separated and heading for a divorce.
Illness (of any sort) can put pressures on any relationship - especially if either or both parties do not understand the extra factors which must be considered on a day-to-day basis.
It is usually the fear of the unknown or a feeling of lack of control which are the hardest to deal with.
Sometimes too, an illness or injury can cause other problems which affect a relationship e.g. earning capacity, insurance cover, housing, hereditary disease being passed on, energy levels, mood swings, physical changes, sexual interest or performance, mobility, related illnesses, early death etc etc. These may or may not affect you now or in the future, but you and any future partner may be fearful or concerned about the possibilities.
Good communication is essential! Talk about what concerns each of you - and get professional advice or treatment early rather than later.
You should make sure that you give yourself time to recover from your last relationship before you embark on another. This means looking at what went wrong in the last relationship and trying to avoid the same mistakes in the future (there are always ways we can handle things better). It also means improving your health and understanding your diabetes. You should perhaps seek further diabetes education and post-relationship counselling (during which you could ask for suggestions on the best way to tell a potential future partner about your diabetes).
Unfortunately, some people use their (actual or imaginary) illnesses as a means of manipulating others. They may "drop their bundle", or they may demand a lot - so there is no guarantee that a fellow-diabetic would be a better choice. True, a fellow diabetic would (hopefully) understand the technicalities and dietary requirements, but any sensible caring person would take the trouble to learn what is required.
If you meet a lady who is sensible and caring - and she can see that you are taking care of yourself and your diabetes well, she will (most likely) feel confident that (with a little education from you and a diabetic organisation) your diabetes will not pose an unreasonable hurdle to a good relationship. It is also quite reassuring to a partner to see you being sensible and pro-active about yourself - as it implies that you will be the same towards her if the roles are reversed sometime in the future.
I would certainly take a positive attitude and keep your options open when choosing a partner.