"If you love something, set it free. If it comes back, it is yours. If it doesn't, it never was."
For a couple that has been married for over seven years, you really should have accumulated enough sentimental reasons to stay together. If you find yourselves being further apart, then there is surely a reason for concern.
The issue now is whether your partner is genuinely willing to work to keep his relationship with you and cherish the family.
Family matters are never for third parties to judge. You alone know the inside stories and your partner's character.
Your case is exactly same as mine. I got married over 11 years. My husband knew a girl 3.5 months ago. But he already rent a house for her 3 months. 我老公願意唔要個家庭及個女, 都要同個女人一齊. 我話比機會同時間佢, 佢都話唔駛. 一定要離婚.