Yes I've definitely found that illness does affect relationships more than people realise. I had a girlfriend who acted all supportive and as if it never bothered her, but she got angry at me for "ignoring" her when I was very sick on holiday. I wasn't ignoring her, but actually just crippled with pain and constantly vomiting while waiting for the ambulance to arrive, but apparently I was ignoring. Makes me laugh haha. But since then I did meet a girl who was very good with it all, she was generally a laid back calm person so there was never "fuss" made which I really liked, but she understood if I didn't feel well and was happy to let me lay and watch movies with her and not go out anywhere and she didn't expect me to eat much if I couldn't handle it. Sadly the relationship ended for other reasons, but she has showed me that it is possible to have crohns and be in a relationship without the illness ruining everything
so I guess you have to hang in there and hope that you'll find the perfect someone soon!