Please tell me your thoughts

My partner went to Cambridge university for a week, she once said to me that she likes it when she sees all of my texts about my day when she gets home so I thought it would be ok if I did that, she can home a week later after i texted her, she barely text me back, which I understand but as a bf, it feels like I should at least be able to know if she’s ok so I don’t worry right? Anyways, she met a guy, added him in Snapchat, I got a bit funny about it because it the pictures she sent me, they were very close, she told me that he was gay, so I believed her, when she told me at the end of the week, today, she said that she feels suffocated, which I also understand, but he wasn’t gay and she lied to me, I feel lost, I don’t think I can do life if it’s like this, I can’t go on if it’s this shit, my whole purpose for a year and a half was to make her happy but now I have no purpose in life, please tell me your thoughts