Me(36M) my(27F) of 3+ years relationship suddenly distant during work on cruise ship without me, what do you think?

For some context we have been living and working together for 3 years happily, we worked together in ships too, always everything together really close. We moved from companies for good offers and we accepted to work for the first time for just once separate for 4 months. So she went to work and I was at home waiting to go with her after 4 month. We have always called and texted each other all the time when not together, and when together we have always been really close. During this period at work we were texting and videocalling everynight as always, then became a little bit less from her side and she was working until late night. After 1 month or little more one night I was waiting her to finish work for calling me and she didn't, was really late like 3/4 am so I sent her texts and the day after she told me she just fall asleep. From that moment she became always less present also if I shared with her my thoughts and we ended up meeting each other a couple of months later in a port were the ship was docking and I felt her really far for me and looking around like someone could have seen her. I asked explanation about all the situation from the first call where she fell asleep to that moment and she just told me that everything was ok, she was tired, that she loved me but from that moment nothing changed, she didn't really have much time to talk to me or calling me but I know for facts that different times she was hanging out parties with colleagues and neither in that moment she had times to make a video call. In the last 2 months the calls she made me I could have count in a hand and for very few minutes. Sometimes I was texting her and not gettin reply for hours, once then she text me but the text was not for me, so I texted her she avoid me and she reply to someone else about making a party than she noticed thatbwas the wrong chat... I have been also in a ship without her for a time and even if I was tired I was calling her every night no matter what, I was taking the phone, calling her and falling asleep with my phone on video call. She has been always my priority and in this 4 months I didn't feel like I'm hers. I feel like something happened, I can also say for fact that another person in her role that I worked with, was not even that busy as she was telling me to be and neither working past 11/12 of the night